TY - GEN digital ID - 132600571 TI - Directed altruism and enforced reciprocity in social networks: how much is a friend worth? AU - Leider, Stephen AU - Möbius, Markus M. AU - Rosenblat, Tanya PY - 2007 PB - Cambridge, Mass. NBER DB - UniCat KW - Zonder onderwerpscode: economie UR - https://www.unicat.be/uniCat?func=search&query=sysid:132600571 AB - ER -