TY  - BOOK
AU  - Bertrand, Marianne
AU  - Mullainathan Sendhil
AU  - Luttmer Erzo F P
AU  - National Bureau Of Economic Research Nber
TI  - Network effects and welfare cultures
T2  - NBER Working paper
U1  - WP 6832 
PY  - 1998///
CY  - Cambridge, MA
PB  - NBER
ER  -