A 20oz/medium coke/pepsi is $2 (McDonald's) to $3 (Wendy's, KFC, Burger King, etc). The majority of people buy one with an entree at all those places. Revealed

A 20oz/medium coke/pepsi is $2 (McDonald's) to $3 (Wendy's, KFC, Burger King, etc). The majority of people buy one with an entree at all those places. Revealed preference vs you living in a bubble.