00315nas a2200121 4500008004100000245002700041210002700068300001200095490000700107100001900114700001600133856004400149 2009 eng d00aIncentives to Exercise0 aIncentives to Exercise a909-9310 v771 aCharness, Gary1 aGneezy, Uri uhttps://dev7.lt.org/incentives-exercise