4.4 Studies of economic outcomes across people and of equality of opportunity is the topic of much empirical research. What are some of the main findings for the US as described in the research by Harvard economist Raj Chetty? Found were you listen to pods or here:https://www.vox.com/2019/8/15/20801907/raj-chetty-ezra-klein-social-mobility-opportunity(Links to an external site.)