When banks park surplus funds with the RBI, they earn the reverse repo rate. A higher reverse repo encourages banks to lend to the RBI rather than the market, tightening liquidity; it is the mirror image of the repo rate.
Example
During surplus-liquidity periods, banks deposit excess cash with the RBI at the reverse repo rate instead of lending it out.
Relevant NISM series
See Reverse Repo Rate in exam questions
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