面向危机与平衡约束的都市农业内生增长模型

An Endogenous Growth Model for Urban Agriculture Based on Urban Crises and Equilibrium Constraints

面对城市危机,二三产业发展的内生性受到挑战,故定位都市农业为应对"中间因风险"的二三产业平衡体,并据此构建内生增长模型.通过最优控制方法求解模型,得到了长期均衡经济增长率、横截性条件、两个子系统各投入要素产出弹性、消费的跨时替代弹性系数之间的关系,以及整个系统的最优条件.结果表明:互补相生的都市农业和城市二三产业可以解决部分城市内生危机;面向危机与平衡约束的都市农业内生增长模型扩展了内生增长模型的描述空间.

Because of various urban crises,the endogenesis of secondary tertiary industries has been challenged.Therefore,urban agriculture was oriented as the balancer for secondary tertiary industries to handle the ＂middle-causation risks＂,and a model of endogenous growth was built.The method of optimal control was employed to obtain the long-term equilibrium economic growth rate,the transversality conditions,the relationship between the output flexibilities of input factors in the two subsystems,the relationship between the elasticity coefficients of intertemporal substitution in consumption,as well as the optimal conditions for the entire system.The results indicate that the combination of urban agriculture with secondary tertiary industries to be a whole is a realistic way to turn urban crises endogenous;furthermore,the endogenous growth model built for urban agriculture in this paper extends the description space of original endogenous growth model,and it will shed light on the development of urban agriculture.