A flexible yuan currency regime will not redress imbalances threatening the global eeconomy, but could help China's booming economy achieve a soft landing, the Asian Development Bank's top economist said on Thursday. "I think the appreciation of the renminbi (yuan) will not do anything for imbalances. But it is in China's interest to have this instrument at hand to bring about a soft landing (of the economy)," Ifzal Ali said at the bank's annual meeting in Istanbul.