draft how do industry human resource practices change the impact of competition on retail food sector by elizabeth davis 1 matthew freedman 2 julia lane 3 brian mccall 4 nicole nestoriak 5 and timothy park 6 paper presented at national bureau economic research conference income wealth july 26 27 2004 disclaimer acknowledgment this is a part us census s lehd program which partially supported science foundation grant ses 9978093 to cornell university institute for social aging alfred p sloan analysis here has undergone much more limited review than an official publication views expressed are attributable only author not represent its sponsors or data providers preliminary version should be cited without permission minnesota twin cities maryland urban georgia abstract rise supercenters entry wal mart into