This is a very important point, often overlooked. It's worth building and maintaining essential capabilities, even if you're not the most efficient at them. E.g

This is a very important point, often overlooked. It's worth building and maintaining essential capabilities, even if you're not the most efficient at them. E.g., a large nation (> 50m people) should be able to feed itself (fine import oranges from somewhere else if you have to, but grow your own wheat and potatoes).