The paper empirically explores the factors that could have accounted for the generally declining aid effort (defined as the generosity ratio, or the share of GDP given as aid) of bilateral donors over the last three decades. Annual panel data over 1970-2000 period for the 22 DAC members are used in a series of regressions. The findings suggest the existence of progressivity of aid in relation to donor income. There is also evidence of the economies of scale, in the sense that the share of aid in income decreases with growth in the size of donor country population. Domestic pro-poor tendency also appears to enhance donor generosity, and a positive ‘peer pressure’ effect is also observed. In addition, the extent of military adventurism of the donor is observed to have enhanced aid effort, just as also the size of government. [Discussion Paper No. 2003/03]
