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Margin can amplify profits, but it can also cause losses to rise faster. Investors using leverage in stock trading should be mindful of how quickly risk can escalate when markets move against them.
Margin is the practice of borrowing money from a securities firm to buy more shares, increasing the size of the portfolio. This can magnify gains when the market moves in your favor, but it also magnifies losses when prices fall.
The biggest risk highlighted is that losses are amplified. Because margin increases the size of the investment, a decline in stock price can cause losses to grow at a higher rate than the investor’s own capital. If not controlled, investors can lose a large portion of their assets in a short period.
Margin is described as more appropriate when there is a clear trend. When the market is volatile or directionless, leverage increases the risk of being squeezed out by short-term price swings.
Margin trading requires maintaining a certain collateral ratio (the margin requirement). If the stock price falls, the collateral value declines. When the ratio drops below a regulatory threshold, the securities firm can require the investor to add funds or sell part of the shares (a call margin). If the investor cannot provide assets in time, the firm may automatically sell shares to recover the debt (forced sale).
The content also notes that forced selling can become a broader market dynamic: if many investors are compelled to sell during sharp declines, sale prices may be suboptimal, losses can worsen, and selling pressure can push prices down further—creating a negative feedback loop.
The most important principle is having a clear risk management plan. Margin is described as suitable only for investors with high discipline and a defined strategy. Predefining stop losses, capital allocation, and worst-case scenarios is presented as a way to reduce risk. Without a risk management plan, margin is characterized as a double-edged sword.
There is no universal margin ratio that fits everyone. The content emphasizes that appropriate usage depends on loss tolerance, experience, and individual strategy. It highlights that investors should clearly define their risk appetite when markets reverse, determine the maximum stop-loss they can tolerate, and maintain a contingency plan.

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