Mumbai, Oct. 10 -- The Reserve Bank of India (RBI) on Friday raised the minimum daily cash reserve requirement for banks to 99% from 90%, while leaving the overall cash reserve ratio (CRR) unchanged at 3%. The change takes effect from the fortnight ending October 31. Banks must maintain a CRR of 3% of their deposits with the central bank, measured as an average over a fortnight. So far, they were required to hold only 90% of that amount on any given day, allowing them to make up the shortfall later in the period. The cash reserve ratio is the portion of their deposits that banks must keep with the RBI in cash. These deposits don't earn any interest and cannot be lent out, making it a key tool for managing liquidity in the banking system. "E...