David Mann, chief currency strategist at Standard Chartered Bank in Hong Kong, says the 100-yen level for the dollar is dangerous because it is a psychological mark for investors.

• 香港渣打银行的首席货币分析师大卫.；曼恩说，在100日圆比价这个水平对美元来说是危险的，因为那是投资人心理指标。