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1. Introduction
In the market economy, the market guides and regulates the economic activities, and it also plays a basic role in allocating resources. However, it is difficult to fully realize the optimal allocation of https://www.51lunwen.org/Economy/2012/0314/1146538048.html

resources relying on market solely. In this process, the market also depends on a number of prerequisites. There are many natural defects in the market itself, and it can’t solve all the problems which humanity is facing. In other words, the reason why the role of public sector intervention in the market economy is so important is that market economy is always disappointing in reality, and there are always many "market failures. It is just because of market failure, the public sector intervention is necessary and possible.

1. Introduction.
2. The benefits of government intervention in the economy
2.1 Avoid the defects of monopoly market
2.2 Avoid the unfair distribution of resource
2.3 Avoid the lack of macroscopic policy
2.4 The inadequacy and asymmetry of information
2.5 External effects
2.6 Fluctuations in the economy
3. The defects of government intervention in the economy
3.1Internality and expansion of the Government
3.2 the failure of public policy
4. Conclusion
5. References

4. Conclusion
The market failures provide the fundamental basis for the public sector intervention in economy. In a market economy country, the economic behavior of the public sector should be concentrated in the areas of market failures, including monopoly, externalities, public goods, redistribution and macro failure. The market failures only rely on the intervention of the public sector. However, the intervention of the public sector is not omnipotent, and it also has the possibility of government failure.

References
Alexander E. Saak, 2007, ‘A note on the value of public information in monopoly’, Economic
Theory, Volume 33, Number 2, Pages 369-379

Arnold C. Harberger,1954, ‘Monopoly and Resource Allocation’, The American Economic https://www.51lunwen.org/Economy/2012/0314/1146538048.html
Review, Vol. 44, No. 2, Papers and Proceedings of the Sixty-sixth, Annual Meeting of the
American Economic Association, pp. 77-87.

Hill B. Wellford , 2009, ‘Introduction to Harberger’s Monopoly and Resource Allocation—The
      Pioneering Article on Deadweight Loss and Empirical Measurement of the Social Costs of
      Monopoly’, Competition Policy International (print ISSN 1554‐0189, online ISSN 1554
      ‐6853), Autumn, Vol. 5, No. 2.

Jean Hindriks, Gareth D. Myles, 2005, ‘Intermediate Public Economics’, (Cambridge: MIT Press)
Chapter 8.

Jacques Pelkmans, Jean-Pierre Casey, 2003, ‘EU enlagement: external economic implications’,
BEEP briefing no. 4, April

Marian F. Ursu, Botond Virginas & Chris Voudouris, 2004, ‘Distributed Resource Allocation via
Local Choices: General Model and a Basic Solution’, Lecture Notes in Computer Science,
Volume 3215, Knowledge-Based Intelligent Information and Engineering Systems, Pages
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