I was there on the bolt in BSE at the time of Crash in March doing my project under my guide and market hit a circuit breaker. I saw people panicking pretty bad, one of the HNI was there for some work, though he had hedge his position in the market still he was worried about possible increase premium for next month put option which raised due to high volatility in the market.
So calculating the cost to any economy of the world won’t be that easy for sure.