Chinese economists say that a stable revaluation of yuan is an efficient way to improve the current national and foreign imbalance but the yearly revaluation should not exceed 3 to 4% this year, reports China Securities Journal.   China’s economic expansion tightens the schedule to formulate a better foreign currency policy. However, Chief of National Economic Research Institute, Fan Gang, says that yuan revaluation is not the only way to change the situation overnight. It requires global cooperation to readjust the relations between Asian revenue and American deficit. Yuan exchange rate should be floating within control but not free floating.   Fang points out that developed countries should also bear the responsibilities to improve the current imbalance. Putting the responsibility solely on China is not fair. “A mere yuan revaluation cannot improve America’s trade deficit,” he continues, “Considering the domination of US dollars in global currency structure, US should also adjust its currency and financial policies.”   Tang Xu of Central Bank Research Bureau adds that trade imbalance requires long-term solutions. Yuan exchange rate should not be manipulated too much but depends on market’s supply and demand.