Please also notice that the economy was growing at a fantastic rate for most of the period that the top marginal tax rates were over 90%; and the last time they

Please also notice that the economy was growing at a fantastic rate for most of the period that the top marginal tax rates were over 90%; and the last time they dropped as low as Reagan-to-now was the period directly leading to the Great Depression. The slope may not tilt in the direction you think it does.