The level of competition among offset suppliers will therefore differ across space. In some cases, the combined service areas of biobanks may not overlap at all, leading to the possibility of monopoly suppliers, in other areas, there may be no supply at all. However, after completing a thorough review of compensation projects, the National Research Council (2001) critiqued the principle of compensating the directly affected area as encouraging “reactive, piecemeal mitigation projects with high failure rates, and for inadequate consideration of the watershed context.”