First, the EU’s fair share of the global effort as calculated by some other approach to equitable effort-sharing would somehow have to be found to be much smaller than that found using the Equity settings considered here. However, since the Low Equity settings assume that capacity is defined with zero progressivity (no development threshold that excludes the income of even the very poor from the calculation of a country’s capacity) this would effectively require a “fair shares” arrangement that is actually regressive, in essence requiring poor countries to contribute more per dollar of income to the global effort than do the richer countries.