Aren't those typically more the middle manager IT/factory floor worker/nurses types though? They're a fair bit above minimum wage. True minimum wage are like waiters at low end restaurant, delivery workers, informal teaching staff, store clerks, fast food cooks etc which I believe most of these African community that can't save enough to get out belong to.
No. I know someone with below average pay who lived decently in Taiwan for a decade before returning to the U.S.

