 A rational choice explanation will refer to her preferences, her beliefs, and the environment in which she chooses. Liza might choose tofu because she prefers tofu to meat. She might choose tofu because she prefers healthy meals to unhealthy meals and she believes that tofu is healthier than meat. She might choose tofu because she is budget-constrained and tofu is cheaper than meat. Or Liza might have more complex preferences. Perhaps all of Liza’s friends have chosen tofu and Liza has a taste for conformity.