Modem agriculture has not only an economic function, but also ecological, cultural, energy, tourism function, corresponding to an economic value, ecological value, cultural value, energy value and tourism value. At present some countries increase agricultural subsidies and protection using the potential value of multi-functional agriculture and positive,extemalities, and damage the interests of agricultural exporting countries, then triggered controversy on the value of multifunctional agriculture. The key of argument is to provide a positive externality of society or to seek theoretical basis...
