The wisest economic decision of United States in the 20th century was establishing the favorable international monetary system, and capturing the leadership position in it. This decision gave economic hegemony to the US for the next more than 7 decades. The continuation of this hegemony till the next decade seems difficult as the US economy is under continuous streams of recessions since 2007. On the other hand, Chinese economy is progressing with a very fast speed and is estimated to pass the US economy till 2025, in various aspects. Will the US be able to continue its leadership in the IMS? Will China replace US in the international monetary system? The answers to these questions have been explored by comparing the economic competitiveness of US and China, with respect to each other. The paper concludes that the change in global economic environment will compel US to share the leadership of international monetary system with China. This sharing will solve most problems of the current IMS, but will also birth some new problems., {"references":["D. Strauss-Kahn, \"Nanjing and the New International Monetary\nSystem\", iMFdirect, International Monetary Fund, 31 Mar 2011.\nAvailable online at http://blog-imfdirect.imf.org/2011/03/31/newinternational-\nmonetary-system/","R. Triffin, \"Our International Monetary System: Yesterday, Today and\nTomorrow\", New York, Random House, 1968.","N. Kaldor, \"The Dollar Crisis\", The Times, 6, 7, 8 September 1971.\n[reprinted in Kaldor, N. 1978, Further Essays on Applied Economics,\nNew York, Holmes and Meier]","\"The Role of the SDR in the International Monetary System\", IMF Staff\nStudy, Washington, DC, 1987.","D. Lipton, \"Refocusing the Role of the International Monetary Fund\",\nDiscussion paper, Carnegie Endowment for International Peace,\nWashington, DC, 1999.","Isabelle Mateos y Lago, Rupa Duttagupta, and Rishi Goyal, \"The Debate\non the International Monetary System\", IMF Staff Position Note, IMF\nResearch Department, November 2009.","Richard N. Cooper, \"Necessary Reform? The IMF and International\nFinancial Architecture\", Harvard International Review, volume 30, Issue\n4, Winter 2009.","\"IMF Resources and the G-20 Summit\", IMF, Washington, DC, 11\nFebruary 2010. Available online at\nhttp://www.imf.org/external/np/exr/faq/sdrfaqs.htm","\"Currency Amounts in New Special Drawing Rights (SDR) Basket\",\nIMF, Washington, DC, 30 December 2010. Available online at\nhttp://www.imf.org/external/np/tre/sdr/sdrbasket.htm\n[10] \"IMF Quota and Governance Reform--Elements of an Agreement\", IMF,\nWashington, DC, 31 October 2010. Available online at\nhttp://www.imf.org/external/np/pp/eng/2010/103110.pdf\n[11] \"Major foreign holders of US treasury securities\", US treasury\ndepartment, United States, 29 April 2011. Available online at\nhttp://www.treasury.gov/resource-center/data-chartcenter/\ntic/Documents/mfh.txt\n[12] Wayne M. Morrison and Marc Labonte, \"China-s Holdings of U.S.\nSecurities: Implications for the U.S. Economy\", Congressional Research\nService, United States, 30 July 2009. Available online at\nhttp://www.fas.org/sgp/crs/row/RL34314.pdf"]}