00354pab a2200133 454500008004000000100002100040245006300061260000900124300001600133362000800149650001600157700001800173773002900191180718b2009   xxu||||| |||| 00| 0 eng d  aCamera, Gabriele  aCooperation among strangers under the shadow of the future  c2009  ap.975-1005.  aJun  aCooperation  aCasari, Marco  aAmerican Economic Review