Richard McKenzie goes on to show how the 9/11 terrorists still kill Americans every day, because their attack distorted the perceived risks and relative prices of air vs. automobile travel, and jacked up both security costs and flight delays. Professor McKenzie also explores the unintended consequences of well-meaning efforts to spur the use of environmentally friendly fuels: starvation among millions of people around the world, and the destruction of rainforests in Malaysia and Indonesia.How can these things be? If you think you know the answers, think again. Why Popcorn Costs So Much at the Movies, And Other Pricing Puzzles shows you that the real reasons are sophisticated and surprising - and in Professor McKenzie's hands, both informative and entertaining.You won't need a degree in economics to enjoy this fascinating book, just an armchair and an inquiring mind.