| Since 1992, the United Nations Conference on Environment and Development, humans had started a new era of sustainable development. But the focus is still on the economic growth, the current mainstream economics is still classical economics (Neoclassical economics and Macroeconomics). The "single growth-type" economic model that based on the classical economics theory, and the "ecological - economic - social coordinated development" economic model that based on the sustainable development theory exist great conflict, even reversed. Sustainable development is concerned about the human overall interests, the earth's ecology benefit interests, the future generations, while the classical economics with "rational economic man" hypothesis as the foundation, is concerned about the "economic man" own benefit maximization, outside of its own interests had been regarded "irrational". In the theory of the directive, actual results is economic growth, but the resources more scarce, environment more and more worse, disaster increasing intensity, human conflict become more and more difficult to reconcile.The development of mankind must walk the path of sustainable development, from the current "growth paradigm" to "sustainable development paradigm". In practice, humans will move away from the era of industrial civilization that conquer, predatory and sacrifice natural ecological environment, and Enter to the ecological civilization times that protect, construction of ecological environment and rebuild the human and the nature harmonious unified common survival and common prosperity. The Economics theory must be improved as the human development needs, rather than "procrustean method", let our economic activities to adapt the original economic theory. So, we must find a way from a single economic growth mode to sustainable development model, from classical economics theory to sustainable development economics theory. So the mankind really took to the road of sustainable developmentIn recent years, how to construct a new economic theory to adapt to the need of sustainable development, is the focus of research sustainable development. Many research and achievements had been done by a lot of Chinese and foreign scholars. But, all the research is still from the classical economic theories foundation. How to surmount the classical economics and also includes classical economic theories foundation, made the present economic development mode smoothly transition to sustainable development economics. That is our current research priorities. This paper on the basis of previous studies, put forward a new thought that construct the sustainable development economics theory, and explores the theory basis in the logical lines, put forward " trinity theory" of sustainable development model. All the research content includes the following aspects:1. Requirements of sustainable development to economics theorySince the industrial revolution had begun, human's material civilization has made great progress. Though the growth pattern that had been formed since that time has created a great deal of material wealth, the conflict between economy development and environment has become more serious, so the sustainable development is the inevitably model of mankind. New development model cannot be sprouted from the old economics theory, the sustainable development need new economic theory to guide.2. The limitations of"rational economic man"hypothesisThe classical economics cannot satisfy the need of new time. The classical economics theories is based on the "empty world", it is unlimited increase. In fact, the mankind economic development has from "empty world" into a "full world", contemporary Economic has been bounded by the environment and the resource. The sustainable development paradigm is conflicted the classical economics'"rational economic man" paradigm, the main reason is: (1) the economic agent is bounded rational; (2) there are exist the information asymmetry and incomplete; (4) the absence of natural subject; (5) the environmental resources of market regulation failure.3. Constructing "social economic man" hypothesisThe transition from the classical economic theories that only care about their own interests to the sustainable development theory that care about the mankind. In order to adapt to the need of sustainable development, expand the"rational economic man", we redefine the individual rationality, think the individual rationality is binary, the"economic man"concerned about his own interests and concern the group that related to him too, so the individual has both rational. The "dual rationality" is called "social economic man" hypothesis. Based on the "social economic man" hypothesis, we construct the framework of the sustainable development economics. "Social economic man" hypothesis beyond the "rational economic man" hypothesis, the"rational economic man"only has a single self-interest rationality but the"social economic man"has two rationality, the self-interest rationality and the social rationality. In "social economic man" hypothesis, we still think individual in economic life is a "economic man", but it is better than "rational economic man" and evolved "social economic man".4. The economic logic lines of sustainable development with "socioeconomic" hypothesisIn the sustainable development, existence the market failure and government failure, the root cause is the information barriers and the opportunism behavior. To reduce the market failure and the government failure, the most important is how to reduce information barriers and reduce the opportunism. Based on the "social economic man" hypothesis, we explores the essence of social capital and civil society organizations (or NGO), and put forward a new logic route for the sustainable development theory. In addition, the civil society organizations in reduce the information barriers has its own advantages. Because of the existence of social capital, the civil society organizations can offset the government failure and the market failure, which can through these information choose effective institutional arrangements to prevent moral hazard and adverse selection. The civil society organizations also exists "voluntary failure", this needs the market, the government and the civil society organizations, cooperated and constructed "NGO-market-government" trinity economic complex system.5. The application analysis of sustainable development economics based on the"social rationality"With "social economic man" hypothesis, analysis the core problem for sustainable development, mainly includes natural resource analysis, intra-generational fair analysis, generation equity analysis and externality theory and so on. In the analysis of natural resources, we put forward the complementary theory; In intra-generational fair analysis of natural resources, puts forward "overall value" and "the decomposing value"; In the analysis generation equity, put forward the key that intergenerational imbalances caused by competitive, need to strengthen cooperation to achieve intergenerational justice; In the externality, made clear the analysis of the definition and nature externality, and puts forward three kinds of the externality, put forward different solutions.
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