Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How do currency markets work? What factors are behind why currencies go up or down?
From my limited experience with foreign exchange... Money is a commodity.. people buy it and sell it like other products.. if "money" is in demand the price goes up.. this is the case when a countries stocks are hot, and you need to purchase that countries currency to buy that stock... I've also seen the currency rise on news and speculation.  Many years ago, I administered foreign receivables... My job was to settle letters of credit from Britain... I remember on one ocassion Margaret Thatcher said something to upset the markets.. her remark caused the price of the UK pound to fluctuate.