Foreign workers indispensable?

Shanmugam is emphasising on the importance of having foreign workers again, as if they are indispensable to our growth and viability as a country. Yes, I agree, we need foreign workers, at least to upgrade the depleted and poor gene stocks we are having today.

Then the question is how many and how fast? We are not a continent like Australia or the US. We are just a little piece of rock. We