Private credit grew by taking on riskier loans that banks shed after Dodd-Frank, making the core banking system safer. However, banks now provide wholesale leverage to these private credit funds with minimal due diligence, creating a new, less transparent concentration of risk.

While the demand for leverage from ETFs contributes to rising equity financing rates, it's not the primary cause. The biggest drivers are higher overall stock prices (requiring more capital to finance the same positions) and the massive balance sheet usage by the rapidly growing multi-manager hedge fund industry.

The profitable "basis trade" (selling futures, buying spot) persists due to strong demand for leverage in less-regulated offshore markets. TradFi hedge funds exploit this by providing capital via regulated futures, a dynamic that intensifies with market momentum.

Despite the focus on LTCM being 'too big' or 'too leveraged' in 1998, the capital deployed in similar relative-value strategies today is 10 to 100 times larger, suggesting the industry has amplified, not learned from, the systemic risks of scale and leverage.

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.

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.

Since 2022, highly leveraged hedge funds have bought 37% of net long-term Treasury issuance. This concentration makes the world’s most important market exceptionally vulnerable, as any volatility spike could trigger forced mass selling (degrossing) from these funds.

Regulatory leverage lending guidelines, which capped bank participation in highly leveraged deals at six times leverage, created a market void. This constraint directly spurred the growth of the private credit industry, which stepped in to provide capital for transactions that banks could no longer underwrite.

Banks can use more leverage and hold less capital by lending to a private credit fund than by making the same risky loans directly to a business. Former FDIC Chair Sheila Bair states this regulatory arbitrage in risk-based capital rules is the primary driver of the private credit boom.