There's no trust or belief - you're just trading one scarce in demand resource due another scarce in demand resource - nothing more and nothing less.
This is the reason your money becomes worth less when we print more. A vendor selling whatever will want even more because his product is just as scarce as it was before, but what you're trading for it has become less scarce, and so has less value.
And taken to extremes this value can approach 0 quite rapidly. Trust, belief and all these things don't matter if you're trying to trade me something I see as less valuable than what you want in exchange for it.
This is the reason your money becomes worth less when we print more. A vendor selling whatever will want even more because his product is just as scarce as it was before, but what you're trading for it has become less scarce, and so has less value.
And taken to extremes this value can approach 0 quite rapidly. Trust, belief and all these things don't matter if you're trying to trade me something I see as less valuable than what you want in exchange for it.