The present study describes some of the mechanisms behind business corruption. It begins by explaining the distinct methodological challenges related to empirical research on corruption. In spite of these challenges, the thesis continues by an attempt to collect information about business corruption. This information is applied in two theoretical analyses of the phenomenon, one about firms' responses to the problem, a second about their propensity to take part. A final chapter in the thesis explains some of the consequences of business corruption, in terms of industrial organization. The author shortly describes the different studies, and finnally summarizes some of their policy implications.