If you study the history of the cryptocurrency bitcoin you realize that bitcoin has been a really rough ride since it was launched around 2009. If you haven't studied the history of bitcoin you should read the book Digital Gold by Nathaniel Popper which covers events up to 2014, so you have to google the rest. If you google you will see that bitcoin reached a price of around $20000 in December 2017, then it crashed, but has since then recovered, reaching a new ATH in 2020. You keep seeing comments that bitcoin is a bubble and it will crash again. But listening to comments by random people on the Internet is not always a good idea. A better idea is to use data and study what has happened before.
The data I found is from Coindesk and ranges from 2010 up to today. It consists of one price during the day and not necessarily the highest or lowest price during the day, but that's not a big deal if you look at the price in a wider perspective. If you look at all the data you can clearly see that it looks like the classic bubble chart.
To better see what has happened from an historical point-of-view, one way is to change the price axis to a logarithmic scale. You can now better see the tops and bottoms:
It's difficult to know where a bottom and a top is. But I've defined a top as the highest price before a fall with more than 50 percent to a bottom. A bottom is the lowest price before a raise to a top which is higher than the top before the fall. A crash is defined as over when the price reaches a new ATH, which bitcoin did 2020-12-01, so the 2017 crash is over.
So bitcoin has crashed the following times:
Now we can see how well the "classic bubble chart" fits the previous crashes:
You can see that the price crashed below the mean line except in one case where the price bounced on the mean line.
It can also be interesting to compare the bubbles before the crash. I've also included the crashes in this chart, so if you bought bitcoin at the first day of trading in 2010 and sold at the bottom after the first crash, you would still have made 2178 percent. But if you managed to buy exactly at the bottom and sold at the top, you would have made:
After a crash there's a recovery back to normal from the bottom after the crash. This is a comparison between them (including 10 days before the bottom).
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