There is often a gap between the prescriptions of an optimal tax system and actual tax systems, some of which can be neither efficient economically nor efficient at redistributing income. With a focus on personal income taxes, this paper reviews the political economics literature on tax systems...

Using global share ownership data from 2002 to 2021, we find that investors’ aggregate carbon sensitivity, i.e. their tendency to divest from more polluting firms, increases with per capita GDP. Especially investment managers, who invest on behalf of their clients, and investors with longer...