This study tests two opposing hypotheses about the impact of aid fragmentation on the practice of aid tying. In one, when a small number of donors dominate the aid market in a country, they may exploit their monopoly power by tying more aid to purchases from contractors based in their own...

The 2005 Paris Declaration on Aid Effectiveness sets targets for increased use by donors of recipient country systems for managing aid. It also calls for donors to be more responsive to the quality of recipient country systems: the optimal level of their use, in terms of maximizing the...

There is relatively little systematic evidence on the links between procurement systems and outcomes such as competition and corruption levels. This paper adds to the evidence base, using data on almost 34,000 firms from the World Bank's Enterprise Surveys, in 88 countries that also have...

Aggregate indexes of the quality of governance, covering large samples of countries, are widely used in research and in aid policy. Few studies examine the validity of these indexes, however. This paper partially fills this gap by examining empirically the dimensionality of the Worldwide...