نتایج جستجو برای: contributions donations
تعداد نتایج: 119312 فیلتر نتایج به سال:
We present a theory of charitable fund-raising in which it is costly to solicit donors. We fully characterize the optimal solicitation strategy that maximizes donations net of fundraising costs. The optimal strategy dictates that the fund-raiser target only those individuals whose equilibrium contributions exceed their solicitation costs. We show that as the income inequality increases, so does...
BACKGROUND Japanese Red Cross (JRC) blood centers implemented anti-hepatitis B core antigen (HBc) screening in 1989 and 50-minipool (MP)-nucleic acid testing (NAT) in 2000. A systematic lookback study has been conducted to determine the hepatitis B virus (HBV) transmission risk of donations drawn in the pre-hepatitis B surface antigen (HBsAg) and/or MP-NAT window phase and by donors with occult...
1942 Emerging Infectious Diseases • www.cdc.gov/eid • Vol. 20, No. 11, November 2014 restricted to plasma for fractionation. Some protection against blood donations from HEV-infected persons may occur because HEV and malaria are coendemic to many countries. Our findings showed a higher HEV seroprevalence among donors with prior malaria or diarrhea deferrals; thus, malariaand diarrhea-related sc...
Human cooperation in large groups and between non-kin individuals remains a Darwinian puzzle. Investigations into whether and how sexual selection is involved in the evolution of cooperation represent a new and important research direction. Here, 69 groups of four men or four women recruited from a rural population in Senegal played a sequential public-good game in the presence of out-group obs...
This paper describes the results of a natural field experiment that investigated voluntary contributions to a public good. The experiment took place at an art gallery where admission was free, but donations could be deposited into a transparent box in the foyer. We manipulated the social information available to patrons by altering what was visible in the donation box. In particular, we investi...
Charity organizations often have limited resources and thus rely on individual contributions of money and time. The existing literature is divided on whether charitable giving and volunteering are complements or substitutes. This paper aims to clarify the relationship between giving time and giving money using 2012 General Social Survey results and to explore whether certain demographical attri...
The article proposes methodological guidelines for studies on a new tool in communication and gift-giving: online donations. It looks at donations the context of gift culture, with particular emphasis changes introduced by digitisation. author argues that are source valuable data, which could prove useful many sciences. As very specific relatively form media market, not an easy research materia...
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