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WELL= GOOD things, could be a warning hint LOL.
And that's why can easy lose more than original account amount\forced selling. Same reason why a repo -autodealer sells or short sale on home sticks you with a deficiency payment you owe the bank or broker or dealer .
Actually usury is not just eXcessive interest;
in some cases, its a word used for saving account interest[seldom if ever excessive,LOL]


As far as only poor using cash/LOL not right, + not accurate in stocks/ETFs or RE.
Most all USa long stock funds use cash with stocks.
Actually with the added risk, poor dont need nor should they get margin.
Good questions.

