Question

why was margin hurt
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Answer 1

I am not sure about my answer but plz don't report it ...

Even if brokers develop the system to do early pay-ins, this would create some risk for brokers if they provide the margin on the trading (T) day, as early pay-in can only happen after market hours. So, some risk-averse brokers may not allow clients to take positions based on unrealised sales on the T-day.

@Mr Masoom❤️