# ERC 621 **ERC 621 – to modify the total token supply** // **ERC-621** || **ERC621** 1. An extension to [[ERC 20]], this standard is to increase or decrease total token supply using two functions, i.e. ‘increaseSupply’, and ‘decreaseSupply’. The proposal recommends that only contract owner or trusted users should use them. Cryptocurrencies are mathematical money, unlike fiat currencies where central banks can increase or decrease the supply. Total token supply is one among many factors determining token appreciation and impacts the economics of a token. This proposal is a draft, and we need to see whether the Ethreum community will implement it, given the wide-ranging impact. Used on [[Ethereum (blockchain)]] blockchain platform, along with [[Ether (ETH)|Ether]] token. On of many [[Ethereum Request for Comments (ERC)]].