The momentum effect is that if the bitcoin price rises continuously over a week, it may keep growing for the next week. This is a common feature of almost all known asset classes, and we have found that the momentum effect strongly affects the cryptocurrency. We have designed a simple investment strategy in which investors buy Bitcoin only when their price increases by more than 20% from the previous week. This strategy has excellent returns and a very high Sharpe ratio. 
You screw my imagination 
, "bitcoin improvement" dan "We have designed a simple investment strategy in which investors buy Bitcoin only when their price increases by more than 20% from the previous week".I think this is a serious discussion but there is only a beautiful adv that gives a simple investment strategy description. For me a simple investment is buying cheap and selling expensive, it's easier.
it goes to show that despite all the adoption that bitcoin had and the fact that it is now being used as a currency more than anytime before, there still are people who only care about the price and see bitcoin as a way of making profit. which is why OP is thinking price rise is an "improvement".
the worst part about it is that people like OP have little understanding of the market and are only contributing to the volatility. for instance they are the reason for the FOMO buys after a certain percentage rise happens and price shoots up suddenly!