The legacy of the merchant kingdom in Southeast Asia is still alive and well in Singapore, for instance. But one of the great lessons of cities that have declined or disappeared is that there's usually a town nearby that's eager to take your place and happy to offer lower taxes. It's almost as if the merchants decide where the people with the funny hats go, rather than the other way around. Thanks for watching. I'll see you next week. Crash Course is produced and directed by Stan Muller. Our script supervisor is Danica Johnson.