Why when the value of Bitcoin falls do other cryptocurrencies fall along with it? 1.Because investors sell other currencies to buy cheaper bitcoin. 2. An investor who has the capacity to hold the money for 1 year generally does not lose money with bitcoin, he may not win, but he does not lose, because within 1 year the chance is very high, almost certain that it will return to the value it was paid for it, and it is not just any certainty, it is based on facts and statistics, statistics that other new cryptos do not have.