Restaurant manager: In response to requests from our patrons for vegetarian main dishes, we recently introduced three: an eggplant and zucchini casserole with tomatoes, brown rice with mushrooms, and potatoes baked with cheese  The first two are frequently ordered, but no one orders the potato dish, although it costs less than the other two
Clearly, then, our patrons prefer not to eat potatoes
ignoring possible differences between what people say they want and what they actually choose