xilinx_altera

解答：关于Economic profit=Sales-implicit cost（Economic depreciation要加上）-explicit cost(accounting depreciation要扣掉), implicit cost=economic depreciation + normal profit＋foregone interest。The return to entrepreneurial ability is greater than normal in a firm that makes a positive economic profit，如果一个企业有正的economic profit，则说明这个企业家能够获得比Normal profit更高的收益。