LMAO!!! You are pulling my leg, aren't you? I mean, just one obvious example:
Tell your self-sufficiency theory to Singapore, a tiny little island country with basically ZERO natural resources, 5.5 million people, the third most densely populated tract of land on the planet. Yet, their standard of living is exponentially beyond the wildest dreams of many basket-case countries with fortunes in natural resources.
By the way, most of those resource-rich, yet scandalously poor, basket-case countries have one thing in common -- they're closed, protectionist economies....