Shi Guangyin had planted trees on the 4,000 hectares desert contracted to run by him ever since 1984, and by 1997 the forest he made was valuated RMB 30 million by the related forestry departments.

• 该文以生态林具备公共物品的特性为前提,运用经济学分析方法,论证了政府提供生态林的必要性和合理性,指出生态林不同于国防、公共安全等纯公共物品,其生产具有可分割性,且私人生产效率高于政府。