Rupee getting weaker has seldom coincided with Nifty keeping going higher. Most of the time Stockmarket goes down whenver the value of Rupee goes down. It happened during September-October '20 also within this madenning equity "rally"
Caveat: Do never overstretch intermarket relationships. The Delta of change in the value of Nifty to Change in USDINR is not constant either. This is a broad relationship.
Hear out the entire video recroding for further caveats and how am I using this chart. This chart prevents me to be an equities bull in abandon. Not yet short on equities, yet not willing to expand exposure on the long side on equities. Once the USDINR chart starts producing the C wave and the uptrend line on Nifty breaks thats when one will trade on the short side on equities.