1.What are some of the reasons why partnered may "cause" (i.e. increase) happiness?

2.What are some of the reasons why happiness may "cause" (i.e. increase chances of) being partnered?

3.What is "reverse causality"?4.What are the "fixed effects"?

5.Why results on the impact of partnered on happiness are lower in panel data?

6.Is there adaptation to being married according to results presented in Frey book?

7.How the results on marriage adaptation in Frey book different from those in Clark book?

8.What is homogamy?