This huge gap spurs migration. People nowadays know much more about conditions in different countries than they did in the past, and if moving across a border means that their income can be multiplied several-fold, they will try to do it.
这种巨大差异促发了移民。现在人们要比以前更为了解不同国家的情况，而且，如果跨过边境就意味着他们的收入可以翻几番，那么何乐而不为呢？