A vast literature uses cross-country regressions to search for empirical linkages
between long-run growth rates and a variety of economic policy, political, and institutional
indicators. This paper examines whether the conclusions from existing studies are
robust or fragile to small changes in the conditioning information set. The authors
find that almost all results are fragile. They do, however, identify a positive,
robust correlation between growth and the share of investment in GDP and between
the investment share and the ratio of international trade to GDP. The authors clarify
the conditions under which there is evidence of per capita output convergence.