Economists assume that people customarily behave rationally, meaning that people: Select one: O a. virtually always weigh the personal benefits and costs of every available action and choose an action on the basis of their individual wants O b. act rationally when they sell products, but not when they buy them O c. are unable to act in an irrational way O d. actrationally when they buy products, but not when they sell them O e. act in a rational way when buying and selling products, but not in other settings