Ethereum 2.0's full transition to Proof of Stake (PoS) impacts ETH value by reducing energy use and altering supply dynamics. Staking locks ETH, decreasing circulating supply, which may increase value if demand persists. Post-Merge (September 2022), staking has grown, with over 31% of ETH staked by 2025, yielding 3-4% APR. Inflation dropped from 3-4% pre-Merge to 0.5-1%, with fee burning making ETH deflationary at times. However, excessive staking could raise inflation if issuance outpaces burns, potentially pressuring ETH value unless balanced by demand or protocol adjustments.