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This explains it, from the White Paper - Page 39;

In order to compensate for the ever increasing precision, the STEEM network performs a 10:1 “reverse split” every 32,000,000 blocks (about 3 years). At this point in time all balances of STEEM are divided by 10 and all prices are multiplied by 10. Cryptocurrency exchanges will have to suspend trading around this time and update the account balances and price history to reflect the “reverse split” before resuming trading.

If the internal exchange "top coins" charts and coinmarketcap-ish tracking sites suddenly show price going up 1000% , it'll trigger all sorts of chaos imo.
Looking forward to it! :D

I know that stocks have done splits and reverse splits, but I wonder if you, or anyone else out there, know if any cryptocurrency has ever done a split or reverse split. Or will steem be the first to try it? If its been done before, what was the outcome?

I'm sure a cryptocurrency has... But no names come to mind. I will look into it a little more this evening...