Bill Hwang turned roughly $200 million into a $20 billion fortune. Two days erased almost all of it. His fatal mistake was not choosing the wrong stocks. He built a position that could not survive one serious move against him.
The same trap hides inside simple arithmetic. If $1 million gains 50%, it grows to $1.5 million. Lose 50% from there and only $750,000 remains. The returns look equal, but $250,000 has vanished because markets multiply capital instead of adding percentages. After a 25% drawdown, recovery requires 33%. After 50%, 100%. After 75%, 300%.
Leverage turns that slow damage into an execution. At 4x, a 10% move against you removes roughly 40% of your equity. A 20% move removes 80%. The thesis may eventually prove correct, but the margin call arrives first. Hwang’s holdings did not need to become worthless. His lenders only needed to stop waiting.
That is why average return is a dangerous scoreboard. It ignores the path, while the path contains redemptions, expiring contracts, trading costs and counterparties demanding cash today. A profitable model can still produce a dead account.
An edge determines the potential prize. Position size, liquidity and funding determine whether you survive long enough to collect it.
The article below explains seven ways a profitable idea can die before it becomes money.
$218 billion is trapped inside a market rule Wall Street can exploit before the closing bell.
The disturbing part is that traders can make the forced order larger while positioning ahead of it. Leveraged ETFs must reset their exposure every day. If a $10 billion 3x ETF rises with its index by 2%, it may need to buy roughly $1.2 billion near the close. A decline turns it into a forced seller.
Inverse ETFs do not cancel this pressure. During a rally, they also buy to reduce their short exposure. Opposite products can therefore push prices in the same direction, making the final hour increasingly predictable.
By late afternoon, trading desks can estimate the next order without inside information. They buy before the ETF, lifting the price and pushing the fund further from its leverage target. This forces the fund to place an even larger order, giving those same traders the liquidity to exit. Wall Street is not simply predicting the trade. It is helping create a bigger one.
A 2026 Princeton study found evidence of this loop in South Korea. The author estimates that arbitrageurs extracted roughly ₩4 trillion from predominantly retail ETF holders in eight weeks. For SK Hynix, the mechanism reportedly pushed annualized volatility from 100.0% to 136.7%.
This has not been confirmed at scale in the US. But the same public rule now controls a record $218 billion. The positions may be private, but the obligation to trade is not. Wall Street does not need the next order to be leaked when the product reveals it.
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