Rectangular milk cartons and cylindrical soda cans : the economics of product design Free peanuts and expensive batteries : supply and demand in action Why equally talented workers often earn different salaries and other mysteries of the world of work Why some buyers pay more than others : the economics of discount pricing Arms races and the tragedy of the commons The myth of ownership Decoding marketplace signals The economic naturalist hits the road Psychology meets economics The informal market for personal relationships Two originals Parting thoughts