Crypto in general is an entirely new field, and with anything new, you will see outlandish economic and social movement. In our current financial system, fiat money essentially retains "value" through the basis of faith and trust in the issuing entity (the government/central bank). Once the issuing entity abuses that privilege through hyperinflation, or people lose faith, the abstract implied "value" of fiat money goes down the gutter. A $100 USD note only has that implied value because individuals and collectives are willing to exchange it for goods and services equating up to that amount. If no one is willing to accept your fiat note, then it essentially worthless.
Bitcoin is a system with no central authority, with a fixed emission/inflation schedule, and fixed supply. It is a "trustless" system, and derives it's unit value through scarcity and utility.