The key is understanding the difference between settlement and buying power. If you sell Apple on Monday, the proceeds normally settle on Tuesday under the T+1 cycle. But if you spot a fresh opportunity in NVIDIA later that same day, you may not have enough settled cash available in a cash account.
A margin account can potentially provide additional buying power during this settlement window, assuming you meet the applicable margin requirements. This gives active investors more flexibility to respond to market opportunities instead of simply waiting for the previous trade to settle.
So, B is the clear answer: margin can help keep your capital working while settlement is still in progress.
@Tiger_AU [龇牙]
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