Crypto Currency is a new payment method in modern society, the future of BTC - ETH - BCH and many other kinds of electronic money will still change in value, but if they let go, this is the thing. can not happen As for the price change, it depends on market factors.

The value is constantly changing, there is no case the same price for 10 years. Because electronic money is a sacred variable over time.

Money to a swap method to buy commodity and services, before non exist, the unit to swap the sale that are the values are equivalent (ví dụ: rau quả, animal, realfood, ...)