Why is the dollar rising? What you need to know

Oil bottom, dollar peak: Paulsen Oil bottom, dollar peak: Paulsen
Thursday, 29 Jan 2015 | 10:24 AM ET | 02:38
Swiss francs are up, the ruble is down, and the euro is sliding back to levels not seen in over a decade.

So what exactly, makes the value of a currency rise or fall?

The short answer: The price is set minute by minute by traders and investors who make bets on which way the market prices of a currency is headed. But there are more powerful, longer-term forces at work driving those bets.