00343pab a2200121 454500008004000000100002200040245004700062260000900109300001400118362000800132650003600140773004500176180718b2005   xxu||||| |||| 00| 0 eng d  aRavallion, Martin  aOn measuring aggregate "social efficiency"  c2005  ap.273-92.  aJan  aEconomic and social development  aEconomic Development and Cultural Change