Economics in the new era, the importance of the role of the State in managing the economy. By the State under a market mechanism will play a role in the creation of the institutions that make the system work better, such as the market determines land ownership rules governing market issuance and exchange market intervention and come upon a failure work not yet completed (2000 J. Stiglitz pp. 76-89), for example, by natural monopoly (Natyral monopoly) to external impact (Externality), economists believe that the market system, in fact, does not occur completely. The Government must come with either strong role so efficiently.
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