* You buy them because they increase earnings and eventually produce dividends at a very high yield to your initial investment.
* The company can issue shares suppressing the price.
* The company can do stock buybacks, increasing the price.
* Brokers can naked short, suppressing the price.
Fiat currency
* You need it to pay taxes and debts.
* Endless Printing.
Gold
* Bought because of limited supply.
* Supply can be increased by settling futures in fiat, or more gold mining or naked shorting.
* Very few have custody.
Bitcoin
* You buy it not for dividends.
* No naked shorting. No stock buybacks because there is no company. Limited new issuance because code=law.
Bitcoin's use case is a reliable means of calculating reciprocation for value provided that can't be interfered with by 3rd parties to the transaction via dilution unless they expend meaningful effort by mining.