Thinking about leverage as simply "on" or "off" is limiting. A more advanced approach views any asset with a lower expected return as a potential liability. One can effectively "borrow" it (i.e., short it) to finance the purchase of an asset with a higher expected return, aiming to capture the spread.

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Contrary to the belief that hot credit markets encourage high leverage, data shows high-yield borrowers currently have leverage levels around four times, the lowest in two decades. This statistical reality contrasts sharply with gloomy market sentiment driven by anecdotal defaults, suggesting underlying strength in the asset class.

Not all debt is negative. Using leverage to acquire assets that generate returns—like real estate, inventory, or business investments—is a smart wealth-building tool. Conversely, financing depreciating lifestyle items ('flexing') creates a financial hole that's nearly impossible to escape.

Products like options or prediction markets for specific metrics (e.g., company earnings) appear complex but can be simpler for investors with a specific thesis. They allow a direct bet on a single variable, avoiding the noise and multiple factors that influence a broad proxy like stock price.

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.

The most under-discussed lesson from the LTCM collapse was not firm-level leverage, but the personal failure of its partners to apply a robust risk framework (like expected utility) when deciding how much of their own wealth to invest in their fund.

Widespread credit is the common accelerant in major financial crashes, from 1929's margin loans to 2008's subprime mortgages. This same leverage that fuels rapid growth is also the "match that lights the fire" for catastrophic downturns, with today's AI ecosystem showing similar signs.

While losses on long positions are common, the experience of a short position moving sharply higher is a uniquely gut-wrenching feeling due to its unlimited loss potential. This highlights the asymmetric risk of shorting and provides a visceral lesson in risk management that every trader should understand, even if only on a small scale.

Profitable companies act as a hedge against currency debasement. They issue long-term debt at low fixed rates, effectively shorting the currency. They then invest the proceeds into productive assets or their own stock, which tend to outperform inflation, benefiting shareholders.

Jeff Aronson reframes "distressed-for-control" as a private equity strategy, not a credit one. While a traditional LBO uses leverage to acquire a company, a distressed-for-control transaction achieves the same end—ownership—by deleveraging the company through a debt-to-equity conversion. The mechanism differs, but the outcome is identical.

The goal of classifying the market into regimes like "slowdown" or "risk-on" is not to predict exact outcomes. Instead, it's a risk management tool to determine when it's appropriate to apply significant leverage (only during clear tailwinds) versus staying defensive in uncertain conditions.