Résumé : We build an occupational-choice general-equilibrium model with for-pro…t …rms, non-pro…torganizations and endogenous private warm-glow donations. Lack of monitoring on the use offunds implies that an increase of funds of the non-pro…t sector (because of a higher incomein the for-pro…t sector, a stronger preference for giving, or an inflow of foreign aid) worsensthe motivational composition and performance of the non-pro…t sector. We also analyze theconditions under which donors (through linking donations to the motivational composition of thenon-pro…t sector), non-pro…ts themselves (through peer monitoring), or the government (usinga tax-…nanced public funding of non-pro…ts) can eliminate the low-e¤ectiveness equilibrium. Wepresent supporting case-study evidence from humanitarian emergencies and developing-countryNGOs.