We present a theory of charitable fund-raising in which it is costly to solicit donors. We fully characterize the solicitation strategy that maximizes donations net of fund-raising costs. It is optimal for the fund-raiser to target only the "net contributors" -- donors who would give more than...

In many important high-technology markets, including software development, data processing, communications, aeronautics, and defense, suppliers learn through experience how to provide better service at lower cost. This paper examines how a buyer designs dynamic competition among rival suppliers...