Exchange rates for example.
If I'm transferring money from the US into my canadian bank account, the exchange rate works against me. 100% of the time.
For example, the $700 US I've just transferred is supposedly worth $670 Canadian Dollars.
However, if I'm buying something using my Canadian account, then of course, Canadian money is worth
less. Systematically. Like my latest purchase over at Waves this morning. Even if the the current exchange rate shows $1 Can = $1.01 US.
You just can't win...