Offer your thoughts or opinion on the input financial query or topic using your financial background.

How do currency markets work? What factors are behind why currencies go up or down?
According to Soros in "The Alchemy of Finance", exchange rates fluctuations are mostly influenced by: (sorry I do not have the quote here, and I am paraphrasing from the top of my head what I read about a week ago). I mention his point of view as he is one of the most successful hedge fund manager ever, proved his skills, and dealt a lot with currencies. This is not just theory as he actively used the above points when managing his fund (as explained in the book). What I find interesting is that, according to him, the fundamental reason (the balance of trade) is not the most influential. Speculation on future value of currencies is the most influential, and these can set trends that can last years. Also it is key to notice that Soros thought foreign exchange markets are "wrong" most of the time, just like he thought stock markets are "wrong" most of the time (a point on which Warren Buffet and Jim Rogers also agree from my understanding).