http://fallout.wikia.com/wiki/Money
According to it, both bottle caps and the NCR's own currency are in use around New Vegas. Soooo... Does this mean there'll be not just one but two currencies in use in the game? And this being shown in all sorts of small says such as, say, NCR people carring their own currency but not caps and vice-versa for, say, people from The Legion? That merchants will ask "So, how'll you pay, caps or NCR money"? That some merchants may refuse using/taking either currency as payment because from their POV, it's almost worthless or a risky currency to use - or they simply want to support their own currency?
It's an interesting idea, having two currencies around at any rate, so I had to ask