I'd contrast that with this chart:http://www.usgovernmentrevenue.com/downchart_gr.php?chart=10-total_30-total_40-total_50-total_60-total&year=1902_2015&units=p

I'd contrast that with this chart:http://www.usgovernmentrevenue.com/downchart_gr.php?chart=10-total_30-total_40-total_50-total_60-total&year=1902_2015&units=p http://www.usgovernmentrevenue.com/downchart_gr.php?chart=10... If you look at Federal Tax Revenue from income taxes you see the pct of GDP stayed remarkably consistent even in times where taxes were much higher. To me that says people will find ways to hide their revenue when taxes are high enough to tip the risk/reward equation in that direction.