> Over time, of course, the price of labor evens out because the resource is no longer underutilized.

The price would have evened out if labor could cross borders as freely as the goods that it produces - then it would flow to areas where it's in high demand. But with borders and immigration controls and different laws (esp. environment and labor) in different jurisdictions, it's not really a free market. Instead, it looks a great deal like a contraption that's deliberately designed to allow transnational corporations to extract massive economic rents from otherwise pointless brokerage (outsourcing).