An experiment was conducted to study how marketing students' ethical decision making was influenced by their perceived moral intensity (PMI), corporate culture, and the reward system. The findings indicate that levels of awareness of the ethical consequences of a decision, the corporate culture, and the reward system all significantly affect ethical decision making. The results provide marketing educators with a framework for understanding the drivers of ethical decision making among marketing students. Given the results, some of the issues associated with teaching marketing ethics are highlighted. (Contains 1 figure and 7 tables.)