This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Well, you understand that currency means money, right? Money amounts are basically numbers, usually preceded (or succeeded) by currency symbols. So the numeric value in the managed bean will be converted to a string in HTML that has a dollar sign in front of it. That's all. Nothing too complicated going on there.
By the way, the current best practice is to use currencyCode instead of currencySymbol.