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.