IF MARKET GOES RED
You will be able to multiple your Bitcoin by using your usdt or Dai to buy back more Bitcoin. RED and GREEN Market.
Fine. Thus number of bitcoin can be multiple. But What if anyone would have bought 1btc at 20000$ in 2017 (by investing 20000$ usd) and 3years have past but bitcoin unable to recover it's price! He/she may have 1.5 bitcoin now but still loss in dollar. Although i know, nobody calculate the way, as i say
