foster child. >>> welcome back. do lower tax rates on the rich spur economic growth? it's something frequently debated. our wealth editor robertrank has the results of a new study. what did you find? >> a new study finds there's, quote, no clear relationship between lower tax rates and economic growth. the study is from the congressional research service. that's a nonpartisan group. this is a very political issue. the group does work for congress. they found while taxes for top earners were much higher in the 1940s and '50s, economic growth was also much higher. twice as high, in fact, as it was in the 2000s. as the taxes for wealthy decline, so did economic growth. of course, there were much bigger forces at work in the economic during these periods, yet the study found no meaningful relationship between tax cuts and rates of individual investment, savings or productivity. now, tax cuts for the wealthy did change one thing in our economy. that was inequality. as the tax rates fell, inequality grew. the share of national income going to the top, 0.1%, more than tripled over the past 30 years to 12%. so cutting attacks ftaxes f