[vkou]

Robinhood's collateral requirements increase when their users buy stock, and decrease when their users sell stock.

If they hit their collateral limits, they have two options.

1. Stop all trading for a few days, as the trades settle, the funds clear, and the collateral requirements drop. Cue millions of pissed users who want to close their positions, but can't.

2. Only stop trades that increase their collateral requirements - buys.

There's also option 3 which is 'immediately get kicked off the settlement networks and go into bankruptcy, because they are trading past their collateral requirements.'

Which of these three options would manipulate the stock price less, and screw over fewer people, in your estimate?