New Delhi, March 25 -- Stock markets have done well this week, the world over. The US markets were up about 6%, at the time of writing, while key European markets were up 5-7%. Most Asian markets rose, too, although India is a bit of an outlier with a drop of 5% in the Nifty 50 so far this week.

Of course, there are concerns among investors about the impact of the lockdown on India's economy.

But also note that the Indian capital market regulator imposed some curbs on short- selling, starting this week. It's interesting that the Indian market is down, when most other markets are up. Could it be that the curbs have backfired?

"Short-selling curbs are a double-edged sword. If they create the impression that the market is being artificial...