You don't end up with 2-3 billion people competing for the work of 320 million. That makes no sense. You just end up with an economy of 2.32 or 3.32 billion.
The 2-3 billion require services and products too, so it's not like they're not consumers (even if their spending is lower if their wages are lower). Plus, the labor pool as a percentage of the population is shrinking in many western countries, and so immigration from countries where the workforce is expanding is required regardless
The 2-3 billion require services and products too, so it's not like they're not consumers (even if their spending is lower if their wages are lower). Plus, the labor pool as a percentage of the population is shrinking in many western countries, and so immigration from countries where the workforce is expanding is required regardless