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It is upcoming, so how can any exchange have an upcoming currency listed yet?

Many exchanges list coins prior to release and allow trading but not withdrawal (as you rightly said, they don’t really exist). I ask as the article doesn’t seem to suggest that 2 coins will exist after the fork.

How can it be done?
How can a nonexistent thing be traded?
For a swap to happen there should be a buyer and a seller.
If it does not exist, how can it be sold?
What happens in such a case if the ICO/HF is postponed or cancelled after people already bought it?

I don’t the precise mechanics but it has happened regularly. It also happened before bitcoin cash forked from btc. Some exchanges were offering the ability to trade it (or more accurately, a representation of it similar to a future). Possibly the exchange knew it had X btc on deposit, so would receive X bitcoin cash? I don’t know exactly how they manage risk.

Futures or options could have been sold, but remember that this is an upgrade, not an overly contentious fork.

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There will not be a significant split. It is merely an upgrade.

So not a fork. In the usual sense unless a lot of miners remain on the old chain!

That's the thing though. A fork is simply a change in the software. Any upgrade is a fork.

Whether it's a soft or hard fork, it will always be a certain degree of "contention" either just human or between hashpower that goes along and hashpower that does not.

Regular users will not have to think it over. They use SPVs and just follow the chain with the most PoW by default.

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