It was usually this altcoin x > ethereum > bitcoin > dump for fiat and cry.
Indeed that's an interesting point which was seldom brought up until now. One can say Bitcoin in 2018 thus took a part of the volatility from alts because you couldn't invest in alts directly that easily. That is no longer the case as in most exchanges now you can dump at least into USDT, if not directly to fiat, and if you invested in exotic tokens you have the route token -> ETH/Solana/whatever -> fiat/stablecoin.
However that didn't only occur to the downside: People also had to buy their altcoins via Bitcoin mostly (with the exception of ICOs which could be paid with fiat, although I think this method wasn't very common back then, most were bought via ETH or BTC). So it's possible that a part of the 2017 bull run could also be attributed to altcoins. Bitcoiners profited from them ... and then suffered the downside volatility.
Yes it was definitely both upside and downside, but during a bullrun you often have tons of liquidity flowing into the market and some resistance because some people will take profits, in particular during a bullrun like in 2017. I held some ERC-20 tokens and I remember many of the flash crashes and how within minutes the order books were empty. People then tried to cut losses at whatever cost and they literally drove some ERC-20 tokens close to zero. They then got some spare ETH or in some cases BTC and it was a time in late 2017 and early 2018 when the sentiment flipped completely. They wanted out and sold BTC without hesitation.
When order books go empty because an ERC-20 bubble popped and the sentiment flips, it is risky to get in / back in.
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I think the fact that many of the new holders are institutional contributes, but it adds volatility to both sides too. The possibility to trade ETFs with the liquidity of a real stock exchange could have added to the extreme forms of leveraged trading we're seeing in the last years, which contributed for example to the 30% dump in a few days between 90k and 60k, as well as the previous dump from 120k to 100k.
That's true, but I was thinking that large investors like institutions or governments or wealthy individuals take more BTC off the market for a longer period of time. If there is less BTC to be traded, there should be less BTC to be put up for sale. Now I admit anticipating the effects on volatility isn't trivial here, but I would assume that there is less overall resistance as most large investors probably don't leave their BTC on exchanges and put them up for sale at certain dollar marks.
Leverage and squeezes surely contribute to volatility though.
I think there are more holders now who have made a rather strong decision to get in and stay for a while.
IMO what matters is the goal to participate from the longer term price increase (which still is excellent) and that can be seen largely independent from the character of the investor (institutional or retailer). The DCA method for example was not very popular in 2017 still as far as I remember. ...
...We still have to see how this bear market plays out, though. Everything is possible I feel.
DCA is probably more common for retail investors. I am not aware currently how BTC saving plans are available across countries, but it is a great option to constantly accumulate and with the upside potential BTC still has in my opinion, it is still a good timing these days.
As for the bear market, is this still a typical bear market? It feels quite neutral. If the definition is that any market significantly below the all time high is considered a bear market, then yes, but I think the catalyst is just missing these days and exchanges don't really have a particular interest in the price going up. They have their daily volume and soak up their portion of every trade. If this goes on for the next five years, I think they could soak up a huge amount of BTC just by watching the price go sideways.