一、公共财政模式下财政支农的理论依据（一）农产品是一种混合产品 ,财政可以介入农业的资源配置领域。就农产品而言 ,它具有明显的消费排他性与受益的可阻止性 ,这使之具有了私人产品的基本特征。但是 ,农产品还具有明显的外溢性。农产品的外溢性一方面表现在它是全人类生存 First, the public finance model of financial support for agriculture theory (A) of agricultural products is a mixed product, finance can be involved in the field of agricultural resources allocation. In the case of agricultural products, it has obvious prohibitions on the exclusivity and benefit of consumption, which gives it the basic characteristics of a private product. However, agricultural products also have obvious spillover. The spillover of agricultural products on the one hand shows that it is the survival of all mankind