BEP-21 is a major upgrade to the existing DAO infrastructure and sets out monetary policy for 2022. The proposal seeks to restructure the BUILD DAO treasury and governance procedures, set a BUILD token target inflation of 25% for the year 2022, and determine target allocations for future BUILD DAO treasury streams. You can read the full proposal here: https://build-finance.medium.com/build-economic-proposal-bep-21-c558467f8d31