Margin buying

Q:
What is the meaning of margin buying

A:
Margin buying is buying securities with some of one's own cash together with cash borrowed from a broker. This has the effect of magnifying any profit or loss made on the securities. The securities serve as collateral for the loan. The net value, i.e. the difference between the value of the securities and the loan, is initially equal to the own cash used. This difference has to stay above a minimum margin requirement. This is to protect the broker against a fall in the value of the securities to the point that they no longer cover the loan.

In the 1920s, margin requirements were loose. In other words, brokers required investors to put in very little of their own money. When stock markets plummeted, the net value of the positions rapidly fell below the minimum margin requirements, forcing investors to sell their positions. This was one important factor contributing to the Stock Market Crash of 1929, which in turn contributed to the Great Depression.