Despite forecasts of over $2 trillion in corporate bond issuance driven by AI spending, net supply is down 20% year-over-year after accounting for maturities and coupon payments. Record inflows into high-grade funds are effectively absorbing this new debt, keeping the supply/demand dynamic in balance.

The primary innovation of bond ETFs was democratizing access to the bond market, which was previously a non-transparent, "voice-driven" system with uneven access. ETFs provided a portfolio of bonds with real-time, on-exchange pricing for all investors, fundamentally changing market structure.

Unlike in past cycles, the riskiest underwriting has largely occurred in leveraged loans and private credit, not high-yield bonds. This migration has left the public high-yield market with higher-quality issuers and shorter durations, making it more resilient than its reputation suggests.

When national stock markets in Greece and Egypt closed during crises, their corresponding US-listed ETFs continued to trade. The price of these ETFs accurately predicted the level at which the underlying markets would reopen, proving their price discovery power.

The investment-grade market's resilience to macro shocks is driven by a surge in retail demand. Weekly fund flows have more than doubled to ~$7.5 billion, creating a powerful technical floor that dampens spread volatility during risk-off events, unlike in previous years.

For 99% of ETFs, liquidity and bid-ask spreads are not based on the ETF's own trading activity. Instead, they reflect the cost for a market maker to buy or sell the underlying basket of securities. An ETF holding liquid stocks can trade billions with tight spreads, even if the ETF itself is rarely traded.

Unlike institutions that focus on spreads, a large and growing segment of retail investors cares only about absolute yield. This creates a durable source of demand, as these investors tend to buy into weakness when yields rise, preventing the sustained outflows and sharp sell-offs seen in past cycles.

Despite significant uncertainty about Fed policy, investors are pouring record funds into bond ETFs. They are looking past short-term volatility to capitalize on the fact that most fixed income assets now yield over 4%, focusing on long-term income generation for the first time in years.

The rise of systematic and electronic trading has fundamentally altered credit market structure. Turnover for every dollar of bonds issued has doubled from 3.5x to 7x in a decade, creating a deeper, more resilient pool of liquidity that is less prone to disappearing in a shock.