India will be a USD 4 trillion economy in 2024-25 and surpass Japan by early next fiscal to become the world's fourth largest economy, Economic Advisory Council to the Prime Minister (EAC-PM) member Sanjeev Sanyal said on Thursday. Sanyal further said that a 7 per cent economic growth rate will be a 'very good' growth rate for India, given various constraints, including the country's weak exports.