the day the market did not let you sell

A friend texted me at 9:20 one morning a few years back. "The app won't let me sell."

He thought something was broken. Nothing was broken. The market had hit its lower circuit and trading was frozen. He spent the next 45 minutes watching an exit he could not take.

Most people find out how a circuit breaker works on the worst possible day to learn it. So here is the plain version, before you need it.

If the Nifty 50 or the Sensex moves 10% in either direction, the entire market halts. Whichever index breaks the level first trips the whole thing. Before 1 PM that halt is 45 minutes. Later in the day it shortens. At 15% the freeze gets longer. At 20%, they close the day. When trading resumes it comes back through a 15 minute pre-open auction, not a normal open.

The detail that actually matters is the one nobody mentions. A lower circuit is not a pause you can trade around. It means the bids have vanished. There is no buyer to sell into at any price. Every "I'll just get out if it falls" plan quietly assumes someone is standing on the other side. At minus ten percent, nobody is.

Which is why I have stopped thinking of the halt as the problem. The halt is a feature. It is a forced timeout against a stampede, and mostly it protects you from the version of you that sells at the bottom.

The honest test is this. If a 45 minute freeze would change what you do with a holding, the position size was the problem, not the screen. A SIP does not notice the market is frozen. Neither should the rest of your plan.

How the market actually works, explained simply: