According to experimental economists, A．more money is offered, fewer people donate blood. B．economic incentives may run in the opposite direction. C．a decreasing number of people donate blood for charity. D．economic incentives clash with 'the moral sentiments'.
A.more B. B．economic C. C．a D. D．economic E.
【参考答案】
B 事实细节题。根据experimentaleconomists定位到第三段。该段列举献血者的例子，说明当“道德......