Currency traders have endured a hair-raising few months. After weathering much of the volatility in the financial markets in the third and fourth quarters of last year, the foreign exchange markets have been making up for lost time. Having touched 12-year lows against the yen in March, the dollar hit its lowest-ever level against the euro on April 22.
The sharp appreciation of the yen, in particular, represents something of a nightmare scenario for some. Regulators have long warned about the ste