Based on the most extensive data available, Psacharopoulos determined that the most effective target would be to halve the proportion of children who are not attending preschool in Sub-Saharan Africa, which would yield social and economic benefits of $33 per dollar spent. This goal, which focuses on a single challenge-plagued region, may seem modest; but it is also realistic and achievable – and the potential returns are massive.
基于可获得的最全面的数据，萨卡洛普洛斯认为最有效的目标应该是将不参加学前班的撒哈拉以南非洲儿童数量降低一半，这样做可以给每一美元投入带来33美元的社会和经济收益。这一集中在单一的、挑战重重的地区的目标相当温和；但也相当现实并且可以实现——而潜在回报相当巨大。