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They won't be forced to switch but they will be highly incentivized to do so, as people in the minority coin sell them out to buy the majority coin.

Will be really interesting if any exchanges support this concept of two bitcoin chains coexisting. I bet they don't.

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Right, but it's also hard to define the "majority" and "minority" coin here. You could define "majority" based on "most hashpower", but say that chain is being mined exclusively by the 3 largest China-based miners, would it still be considered the most valuable? Or maybe only by one miner, like when ghash.io was over 50%?

If the exchanges don't support the concept, it'll still at least be up to the user to figure out which chain the exchange is on.

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