It's called Hauser's Law, according to the Wall Street Journal, and more or less it points out that when government attempts to take more than Joseph's 20% tax (Genesis 41:34), people find ways around that tax.
This explains why so much of the economy is in the black market in places like Italy and Greece, and it has a parallel in the United States with estimated tax evasion of about three hundred billion dollars; there is a limit to how much taxation citizens will endure, and when government attempts to go beyond that level, they succeed only in pushing their citizens out of the legitimate economy--impoverishing the people and actually cutting tax revenues.
The WSJ article suggests that it's merely an empirical law; I would suggest, rather, that Scripture subtly but firmly points out (see Genesis 41, 2 Chronicles 10) that there are limits to what level of taxation government can extract without causing disaster. It is, perhaps, God's Laffer Curve.
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