Leopold Aschenbrenner's fund, despite a strong AI thesis, was margin called due to massive leverage. This shows how short-term market corrections, amplified by leverage, can destroy fundamentally sound, long-term positions—a classic lesson Warren Buffett has warned about for decades.

The key to using leverage safely is to keep the loan-to-value ratio extremely low. Bill Ackman suggests 5% ($0.05 of debt per $1 of assets) may be fine, while 30-40% invites disaster. True wealth is built on having the cash reserves to avoid selling at the bottom.

Leopold Aschenbrenner's hedge fund used high leverage to achieve 1000% returns, but this same strategy amplified losses catastrophically during a market dip, forcing a fire sale. Like the NOS button in 'The Fast and the Furious,' leverage creates binary outcomes of massive success or total failure with no middle ground.

Modern trading platforms use AI to monitor margin accounts. If your collateral's value dips below a required threshold for even a millisecond, the system automatically sells your assets to protect the broker. This instantaneous, automated process can wipe out a portfolio before a human can possibly react.

According to Andrew Ross Sorkin, while bad actors and speculation are always present, the single element that transforms a market downturn into a systemic financial crisis is excessive leverage. Without it, the system can absorb shocks; with it, a domino effect is inevitable, making guardrails against leverage paramount.

Leverage is attractive on the way up but brutal on the way down. Its true danger isn't creating new risk, but eliminating any room for error in an investment thesis. This lesson is repeatedly and expensively learned by each new generation of investors, as seen in recent market collapses.

Gambler Edward Gilbert used leverage to fund his stock market plays. When the market turned, margin calls forced him to sell at the worst possible time, turning a manageable stock drop into a catastrophic loss. Leverage removes the option to wait out volatility, destroying sound investment strategies.

While low rates make borrowing to invest (leverage) seem seductive, it's exceptionally dangerous in an economy driven by debt management. Abrupt policy shifts can cause sudden volatility and dry up liquidity overnight, triggering margin calls and forcing sales at the worst possible times. Wealth is transferred from the over-leveraged to the liquid during these resets.

Ackman debunks the trope that the wealthy borrow against assets. He warns this exposes investors to margin calls during downturns, forcing sales at the worst time and destroying long-term compounding, citing Carl Icahn as an example of the risk.