"...Amnesty International's listing of human rights abuses shows a definite pattern where those nations with the least respect for human rights are also the poorest. By contrast, those with the greatest respect for human rights tend to be the richest."
- Walter Williams, ALL IT TAKES IS GUTS
Causation? I think so. The limitation of liberty by oppression and domination, creates an economic environment in which people are less effective at meeting their own needs through production.