Before reading on, it is worth answering one question. You put up $500 and buy $1,000 worth of stock on margin, borrowing the other half. The stock then falls by 50 per cent, and you sell. Roughly how much of your original $500 is left?
Hold that number for a moment.
The question comes from the FINRA Investor Education Foundation's latest survey of American investors, 2,861 people surveyed between July and December 2024, with results published in December 2025. Across eleven investing questions, respondents answered 5.3 correctly on average. On this one, the detail that stands out concerns the people who actually use the tool it describes. Among investors who make purchases on margin, 75 per cent answered it incorrectly.
Experts at NAGA, a multi-asset platform that offers contracts for difference alongside a free academy and a social feed where users share their positions, read that figure as a design brief. If three in four people using a tool cannot do its arithmetic, the arithmetic has to be placed where the decision is made, not left in a glossary.
The answer, and why it surprises people
The answer is approximately nothing. The position was worth $1,000 and is now worth $500. The $500 that was borrowed still has to be repaid in full. Once it is, the original stake is gone, before any interest or charges are counted.
The tempting answer is $250: the stock fell by half, so half the money must be gone. That intuition is correct for an unleveraged purchase and wrong for a leveraged one. With borrowed exposure, gains and losses are calculated on the full size of the position, while the investor's own money is only the smaller part underneath it. A 50 per cent fall in the asset becomes a 100 per cent loss of the stake.
None of this is obscure. It is the defining property of leverage, and it is precisely the property that three in four margin users in the survey did not apply correctly.
Using a tool and understanding it are different skills
What makes the 75 per cent figure uncomfortable is who it describes: people who have actually placed the order, answering a question about a tool they already use. Familiarity with the button has not translated into familiarity with the arithmetic behind it.
The survey also asked investors to rate their own knowledge, and the result is more nuanced than a simple story about overconfidence. According to the full report, a majority, 56 per cent, rated themselves highly knowledgeable, and that group did score better than those who rated themselves low, 6.0 correct answers against 4.1. Confidence was not meaningless. It was attached to a score of barely more than half.
The age pattern adds to the concern. According to the Foundation, investors under 35 were far more likely to buy on margin than those aged 55 and over, 22 per cent against 4 per cent.
Where a leveraged-products platform fits in
Contracts for difference are leveraged by design, so the FINRA finding is not abstract for NAGA. Every leveraged position opened on any such platform shares the core arithmetic of that survey question: the result is calculated on the full exposure, not on the money put up.
That is why the platform states the arithmetic plainly. Its own explainer on leverage frames margin as a security deposit and draws the consequence directly: a modest move against a position can remove the entire amount put up.
The practical habit NAGA's experts suggest takes less than a minute. Before opening any leveraged position, work out the percentage move against it that would erase the deposit. If the exposure is five times the money committed, that move is 20 per cent. At ten times, it is 10 per cent. Seeing that number written down before the order is placed does more for understanding than reading about leverage in general. For anyone who wants to experience the arithmetic without consequences, NAGA's demo account applies it to virtual funds.
The same logic runs through the platform's copy-trading leaderboard. Each lead trader carries a Risk Score from 1 to 10, calculated in part from how much margin they use and whether they have been stopped out before. Anyone choosing whom to follow sees that margin behaviour next to the results, without having to work it out.
What the survey does not show
The finding has limits, and NAGA's experts name them. The survey covers investors in the United States, and its margin question concerns borrowing to buy shares, a related but not identical arrangement to trading a leveraged contract. One wrong answer on a questionnaire also says nothing definite about how any individual trades.
Knowing the arithmetic also leaves the risk itself where it was. Trading leveraged products can lead to substantial losses; what the arithmetic adds is the ability to see their possible size before the order goes in.
If the number you held at the start was anything other than roughly zero, you answered the way most margin users did. The useful part is that the correction takes about thirty seconds, and it is the same thirty seconds whether the next leveraged position is in a share, an index or a currency.
Trading leveraged products involves a significant risk of loss and is not suitable for all investors.
