00522pab a2200157 454500008004000000100001800040245012400058260000900182300001400191362000800205650003800213650003700251650002200288700001900310773003500329180718b2004   xxu||||| |||| 00| 0 eng d  aHortascu, Ali  aProduct differentiation, search costs, and competition in the mutual fund industry: a case study of S&P 500 index funds  c2004  ap.403-56.  aMay  aFinancial markets - United States  aFinancial markets - Case studies  aFinancial markets  aSyverson, Chad  aQuarterly Journal of Economics