The supply of Ethereum should decrease after the network transitions from proof of work to proof of stake. There are currently over 118 million ETH in circulation. And even though there's no supply cap on the cryptocurrency, don't expect that number to get too much bigger.
According to simulations from Ethereum tracker Ultrasound Money, after the transition to proof of stake, the supply of ETH is set to decline 2% annually. If current rates hold, the blockchain will start burning more Ethereum than it produces with each new block.
At the beginning of August, Ethereum developers hit the "go" button on one of the biggest upgrades ever to the blockchain. The London hard fork included EIP-1559, an Ethereum improvement proposal that both upped the block size to help combat congestion on the network and destroyed transaction fees rather than send them to miners.
The goal was to place deflationary pressure on an asset that already has a circulating supply six times larger than Bitcoin's. That's largely been achieved. According to stats from Watch the Burn, there's been a 57% reduction in ETH issuance to date; over 1.1 million ETH have been distributed as block rewards to miners while nearly 630,000 have been burned.
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