After the Merge the blockchain will split in two giving you bonus coins (Ethereum POW).
You will only receive bonus coins if you own Ethereum at the point of the merge. (15% of the supply is locked in the staking pool and will be deleted in the new POW fork). Make sure that your wallet support ETH POW or move your coins to a wallet where you have access to the private keys.
After 15 september:
POS (ethereum coin) ($1700 a coin) (Will be supported by those who believe in POS)
POW (ethereum coin) ($50 a coin) (Will be supported by those who believe in POW)
Ethereum POW Coins can already be traded on 9 exchanges with a 1:34 difference in the price at 1 MUSD volume per day. (Futures)
Interesting update. The liquidity does still seem to be a bit low. But I'm sure that will change rapidly in the coming weeks... especially as bigger exchanges list it.