They say what goes up must come down, but it isn’t usually supposed to happen at the same time. Here’s one thing that can manage it: The Korean won. The currency is down against the US dollar in April, falling from 1,470 won to as low as 1,418 won. Or should that be rising? It’s all a lot simpler if you work in euros. When the value of the euro rises, so does the usual currency exchange rate, which measures how many dollars you get for one euro. But like the Japanese yen and the Chinese yuan, th