... These surveys contain information on demographics, education, income and expenses. The second source is FITEL’s administrative information containing the GPS location of each phone and the date ... dissertation: ESSAYS ON PUBLIC AND DEVELOPMENT ECONOMICS Diether Wolfgang Beuermann, Doctor of Philosophy, 2010 Dissertation directed by: Professor Mark Duggan Department of Economics ... regarding the economic effects of TC concentrate on market outcomes, with a specific focus on price dispersion and market performance. However, none directly address effects of new TC on producers’...