If you double the size of a city from 100,000 to 200,000, from a million to two million, 10 to 20 million, it doesn't matter, you get a 15 percent increase in wages, wealth, number of AIDS cases, number of police, anything you can think of.
如果一个城市的规模从10万增长至20万 从一百万到两百万 从一千万到两千万 都一样 在这个城市中 工资 财富 艾滋病病例 警察人数 任何你能想到的事物