Re: cash is not the only money
As a thought experiment, run a hypothetical economy on bitcoins. If you need to increase the money supply above the fixed (and decreasing) rate at which new ones are created, your only recourse is to (somehow) increase the value of a bitcoin.
Any good or service that you could buy with one bitcoin now costs less than one bitcoin, and it had nothing at all to do with improvements in the production of that good or rendering of that service. Hence deflation.
Goldbugs and bitcoin pumpers want this to happen because they hold gold or bitcoins, and they think it will make them rich.