00393pab a2200133 454500008004000000100001900040245009700059260000900156300001400165362000800179650001600187700002700203773002900230180718b2009   xxu||||| |||| 00| 0 eng d  aCharness, Gary  aCooperation and competition in intergenerational experiments in the field and the laboratory  c2009  ap.956-78.  aJun  aCooperation  aVilleval, Marie-Claire  aAmerican Economic Review