system
Given the following post, respond as if you're commenting on Reddit:
human
Does skilled migration from poorer countries hurt poorer countries on net?

The arguments for are obvious - having less intelligent/educated people in the home country means lower productivity

The arguments against are just remittances sent by the migrants

So what does the evidence say? Is skilled migration net harmful to the native countries of the migrants? Does it depend on exactly how poor the country the native is from, or other factors?
gpt
You’re describing a really well-studied phenomenon called “brain drain” (or human capital flight, to use the more academic term), and yes, it’s demonstrably harmful to the economies of developing countries for two main reasons. 

The first is the most direct and obvious consequence: brain drain creates a shortage of skilled labor in vital professions (doctors, engineers, etc.), which are pretty vital for the operation and development of a healthy economy.

The second, more indirect consequence is that it reduces aggregate demand and surplus spending units. This is because the skilled laborers that have the opportunity to emigrate represent particularly well-salaried segments of the economy. When they leave, the economy loses a key segment of a) consumers and b) people with surplus income that they can invest back into the economy for future growth.