The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Bernhard Walke - One of the best experts on this subject based on the ideXlab platform.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing
    Wireless Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station. Copyright © 2004 John Wiley & Sons, Ltd.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing research articles
    Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station. Copyright © 2004 John Wiley & Sons, Ltd.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing emerging wlan applications and technologies
    Wireless Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station.

  • ieee 802 11e wireless lan resource sharing with contention based medium access
    Personal Indoor and Mobile Radio Communications, 2003
    Co-Authors: Stefan Mangold, Guido R Hiertz, Bernhard Walke
    Abstract:

    Controlling medium access priorities in wireless networks is difficult when multiple Radio Stations operate according to the popular IEEE 802.11 contention-based protocol. Although the new standard 802.lie defines enhancements for controlling priorities in this distributed medium access control protocol, it does not provide algorithms for the calculation of the achievable throughput per station, when different Stations operate with the different priorities. Such an algorithm is discussed in this paper. The evaluation by means of simulation indicates that the algorithm approximates the achievable throughput in many different scenarios.

Frederico Finan - One of the best experts on this subject based on the ideXlab platform.

  • exposing corrupt politicians the effects of brazil s publicly released audits on electoral outcomes
    Quarterly Journal of Economics, 2008
    Co-Authors: Claudio Ferraz, Frederico Finan
    Abstract:

    This paper examines the extent to which access to information enhances political accountability. Based upon the results of Brazil’s recent anti-corruption program that randomly audits municipal expenditures of federally-transferred funds, it estimates the effect of the disclosure of local government corruption practices upon the re-election success of incumbent mayors in municipal elections. Comparing municipalities which were randomly audited before the elections with those audited after, the analysis shows that the disclosure of audit results had a significant impact on the re-election rates of mayors found to be corrupt. For a one standard deviation increase in reported corruption, the audit policy reduced the incumbent’s likelihood of re-election by 25 percent. This effect is more pronounced in municipalities where Radio Stations are present and higher levels of corruption are identified. These findings highlight the value of information and the role of the media in reducing informational asymmetries in the political process, thus enabling voters to not only hold corrupt politicians accountable but also to reward non-corrupt politicians.

  • exposing corrupt politicians the effects of brazil s publicly released audits on electoral outcomes
    Research Papers in Economics, 2007
    Co-Authors: Claudio Ferraz, Frederico Finan
    Abstract:

    This paper examines whether access to information enhances political accountability. Based upon the results of Brazil’s recent anti-corruption program that randomly audits municipal expenditures of federally-transferred funds, it estimates the effects of the disclosure of local government corruption practices upon the re-election success of incumbent mayors. Comparing municipalities audited before and after the elections, we show that the audit policy reduced the incumbent’s likelihood of re-election by approximately 20 percent, and was more pronounced in municipalities with Radio Stations. These findings highlight the value of information and the role of the media in reducing informational asymmetries in the political process.

Stefan Mangold - One of the best experts on this subject based on the ideXlab platform.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing
    Wireless Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station. Copyright © 2004 John Wiley & Sons, Ltd.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing research articles
    Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station. Copyright © 2004 John Wiley & Sons, Ltd.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing emerging wlan applications and technologies
    Wireless Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station.

  • ieee 802 11e wireless lan resource sharing with contention based medium access
    Personal Indoor and Mobile Radio Communications, 2003
    Co-Authors: Stefan Mangold, Guido R Hiertz, Bernhard Walke
    Abstract:

    Controlling medium access priorities in wireless networks is difficult when multiple Radio Stations operate according to the popular IEEE 802.11 contention-based protocol. Although the new standard 802.lie defines enhancements for controlling priorities in this distributed medium access control protocol, it does not provide algorithms for the calculation of the achievable throughput per station, when different Stations operate with the different priorities. Such an algorithm is discussed in this paper. The evaluation by means of simulation indicates that the algorithm approximates the achievable throughput in many different scenarios.

Guido R Hiertz - One of the best experts on this subject based on the ideXlab platform.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing
    Wireless Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station. Copyright © 2004 John Wiley & Sons, Ltd.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing research articles
    Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station. Copyright © 2004 John Wiley & Sons, Ltd.

  • ieee 802 11e 802 11k wireless lan spectrum awareness for distributed resource sharing emerging wlan applications and technologies
    Wireless Communications and Mobile Computing, 2004
    Co-Authors: Stefan Mangold, Zhun Zhong, Guido R Hiertz, Bernhard Walke
    Abstract:

    Coordinating priorities in wireless medium access is difficult when Radio networks operate with contention-based medium access. Contention-based medium access protocols such as listen-before-talk are widely employed today, and for example used in the popular IEEE 802.11 protocol. Contention-based protocols are used for wireless communication in unreliable Radio environments such as the unlicensed frequency bands with their typically irregular and unpredictable interferences. However, to support time-bounded traffic with a certain quality of service (QoS) support is extremely difficult, because it requires the knowledge of how aggressive other Radio Stations, which also contend for Radio resources, access the medium. In this contribution, we discuss a new measurement in the IEEE 802.11k draft standard, together with the IEEE 802.11e draft standard for coordinating priorities. By combining the two extensions of IEEE 802.11, we develop an algorithm that allows Radio Stations to estimate the achievable throughput per Radio station (the saturation throughput) in the presence of other Radio Stations. Our algorithm further allows predicting the saturation throughput per Radio station in the presence of other non-802.11 Radio networks, because it only relies on the information about how the medium is used by other Stations, i.e. for what duration other Stations have to sense the medium as idle before initiating transmissions. The algorithm does not require knowledge about the contention-parameters (like, e.g. minimum contention window sizes) used by other Radio Stations, and only relies on medium sensing information. For this reason, we refer to spectrum awareness in this work. We modify an existing model that was originally developed for calculating the saturation throughput in IEEE 802.11, to calculate the saturation throughput for IEEE 802.11e with one single priority. We then describe a new measurement, which is part of the IEEE 802.11k draft standard. The measurement provides information about medium access probabilities of other Radio Stations per contention window slots. These probabilities provide the information about how aggressive the medium is utilized by other Stations. The probabilities are used in our model for approximating the saturation throughput per station and priority in the presence of other Radio Stations. As a result, with the help of the new model, a Radio station is able to estimate its own expected saturation throughput. The comparison of the model with stochastic simulation Stations indicates that our model approximates the saturation throughput per station and priority sufficiently in many scenarios, and hence allows to predict expected saturation throughputs per Radio station.

  • ieee 802 11e wireless lan resource sharing with contention based medium access
    Personal Indoor and Mobile Radio Communications, 2003
    Co-Authors: Stefan Mangold, Guido R Hiertz, Bernhard Walke
    Abstract:

    Controlling medium access priorities in wireless networks is difficult when multiple Radio Stations operate according to the popular IEEE 802.11 contention-based protocol. Although the new standard 802.lie defines enhancements for controlling priorities in this distributed medium access control protocol, it does not provide algorithms for the calculation of the achievable throughput per station, when different Stations operate with the different priorities. Such an algorithm is discussed in this paper. The evaluation by means of simulation indicates that the algorithm approximates the achievable throughput in many different scenarios.

Claudio Ferraz - One of the best experts on this subject based on the ideXlab platform.

  • exposing corrupt politicians the effects of brazil s publicly released audits on electoral outcomes
    Quarterly Journal of Economics, 2008
    Co-Authors: Claudio Ferraz, Frederico Finan
    Abstract:

    This paper examines the extent to which access to information enhances political accountability. Based upon the results of Brazil’s recent anti-corruption program that randomly audits municipal expenditures of federally-transferred funds, it estimates the effect of the disclosure of local government corruption practices upon the re-election success of incumbent mayors in municipal elections. Comparing municipalities which were randomly audited before the elections with those audited after, the analysis shows that the disclosure of audit results had a significant impact on the re-election rates of mayors found to be corrupt. For a one standard deviation increase in reported corruption, the audit policy reduced the incumbent’s likelihood of re-election by 25 percent. This effect is more pronounced in municipalities where Radio Stations are present and higher levels of corruption are identified. These findings highlight the value of information and the role of the media in reducing informational asymmetries in the political process, thus enabling voters to not only hold corrupt politicians accountable but also to reward non-corrupt politicians.

  • exposing corrupt politicians the effects of brazil s publicly released audits on electoral outcomes
    Research Papers in Economics, 2007
    Co-Authors: Claudio Ferraz, Frederico Finan
    Abstract:

    This paper examines whether access to information enhances political accountability. Based upon the results of Brazil’s recent anti-corruption program that randomly audits municipal expenditures of federally-transferred funds, it estimates the effects of the disclosure of local government corruption practices upon the re-election success of incumbent mayors. Comparing municipalities audited before and after the elections, we show that the audit policy reduced the incumbent’s likelihood of re-election by approximately 20 percent, and was more pronounced in municipalities with Radio Stations. These findings highlight the value of information and the role of the media in reducing informational asymmetries in the political process.