2448-7678 2448-7678 S2448-76782008000200023 Mexico Mexico USA 00 12 2008 00 12 2008 37 102 23 28

2000 38 1 1 27-47 2007 31 4 4 493-516 2002 1989 1997 23 3 3 409-73 OECD 2006 1996 5 1 1 23-39