On the provision of official and private foreign aid

The provision of official relative to private foreign aid varies considerably between donor countries. We explain the variations in terms of country size, household composition, income distribution, and the government's ability to commit to aid, and derive inter alia the results: (1) official aid crowds out private aid, (2) total aid and official aid collected from each household are lower in more populous countries, (3) total aid is lower if (i) the distribution of income favors the more altruistic households, and (ii) the government can credibly commit to a certain level of aid. Evidences suggest that the theoretical results can explain stylized facts.