Why not? How else have they managed to accumulate 40% of the wealth? This must be the case, mathematically. Wealth is the integral of net income over time. And

Why not? How else have they managed to accumulate 40% of the wealth? This must be the case, mathematically. Wealth is the integral of net income over time. And savings rates are heavily skewed by income: http://static1.businessinsider.com/image/513125876bb3f7db40000004-960/moneygame-cotd-030113.jpg http://static1.businessinsider.com/image/513125876bb3f7db400...