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For example, when bitcoin moves up/down, most other cryptocurrencies also move for a similar amount. What is the reason behind this? I almost see no point in investing in different cryptocurrencies, when it seems that when Bitcoin falls, Ethereum (or any other crypto) also falls.

Only reason I can figure out myself is because all cryptocurrencies belong into the same group of currencies, but is there something else that affects these same price changes?

closed as off-topic by Jestin, Зелёный, fredsbend, kaykurokawa, Highly Irregular Jan 30 '18 at 9:10

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  • "Questions on current or future market values, energy costs or service provider availability are off-topic as the answers are changing too frequently to be useful to others." – Jestin, Зелёный, fredsbend, kaykurokawa, Highly Irregular
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  • This is not always true. For a while in December, I watched BTC and BCH and noticed that they would move in sequence. One would move, the other sit. Then the other would move and the first sit. Market forces are hard to pinpoint. – fredsbend Jan 26 '18 at 22:23
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The reason many The answer is that many altcoins are traded in BTC/ALTcoin pairs, not $$/ALT pairs.

So if an altcoin is trading 0.1 BTC/ALT, and the dollar price of bitcoin falls, then the $ price of the ALT will fall an equal amount.

Some altcoins trade against dollars as well, so their dollar price may be less coupled to the BTC dollar price. But for many of those alts, a large amount of the trading volume will still be from the BTC/ALT pair, and so the influence is still there.

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