Quotes from Richard B. McKenzie

people's stupidity probably explains much of what people do and don't do, as I have conceded all along in this book.

The law of unintended consequences rules, often with deadly silence.

Ralph's (and virtually all other) grocery stores provide customers with "frequent-buyer" or "Club member" cards that entitle holders (Group B) discounts not provided customers without cards (Group A), on the argument that people who tend to buy frequently (and/or buy in large quantities) have good reason to comparison shop and to obtain the frequent-buyer cards: they can prorate their search costs over a large number of purchases.11