In the Prairies you could put a lot of people on farmland and it wouldn't subtract very much productive capacity and would accommodate a lot of people. A square

In the Prairies you could put a lot of people on farmland and it wouldn't subtract very much productive capacity and would accommodate a lot of people. A square mile is roughly 800mt of grain give or take most years on prime farmland.. the economic value of that vs the sheer number of people you can house on that space with reasonable density, the tradeoff is a non-issue. (That's why developable land on the edge of Winnipeg trades at $25k/ac and the same land 10 miles away is worth 5-6k/ac.)