system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Why do people use bottle caps for currency?

The NCR seems capable of mass producing paper money, and the Legion is able to find enough gold to make coins, so why does everyone use bottle caps?
gpt
Universal availability, durability and the inability to reproduce it. 

Nuka Cola was available almost the world over, meaning you have a standard currency regardless of the community you are dealing with.

Bottle Caps can be stepped on, crushed, tarnished and thoroughly beaten and still be recognizable. 

The fact that no one can really reproduce them means you have a consistent 'global market'. The value doesn't change with the overproduction of a currency.