Monitor HYG/LQD credit spreads, IG vs HY spread differential, and TLT; classify credit market stress
Answers whether credit markets are showing stress, and how severe it is. It reads high-yield and investment-grade credit spreads and Treasury yields when available, plus 7-day price moves in HYG, LQD, and TLT as proxies, and classifies stress as low, moderate, elevated, or high. Use it to read credit conditions alongside equities rather than ahead of them: the popular claim that credit reliably leads equities does not hold up at the firm level, where the price-discovery literature often finds the reverse, so treat a widening spread as evidence about perceived default risk rather than as a timing signal.
Credit spreads as a measure of perceived default risk, and an honest treatment of the lead-lag claim usually attached to them.
A credit SPREAD is the yield on a corporate bond less the yield on a comparable-maturity government bond. That difference compensates for default risk and illiquidity, so it widens when investors demand more to hold corporate credit. High-yield spreads react more than investment-grade because the underlying default risk is more sensitive - which is why the two are read together rather than singly.
When spread data is unavailable the analysis substitutes 7-day price moves in HYG, LQD and TLT. That substitution has a cost. These are ETFs: their prices reflect the underlying bonds plus fund-level effects - premium or discount to net asset value, flows, and the fact that a continuously traded fund reprices faster than an illiquid bond market. A price move is also not a spread: it mixes the change in credit spread with the change in the underlying government yield, so a fall in HYG can reflect rising rates rather than rising default risk. TLT in particular carries almost pure duration, not credit.
ON THE LEAD-LAG, which is where this analysis is most often overclaimed. "Credit leads equities" is not a dependable stylised fact. There is real evidence that AGGREGATE credit conditions carry forecasting information for economic activity and, at some horizons, for returns. At the firm level the price-discovery literature frequently finds the opposite: Kwan (1996) on bonds and stocks, and Norden and Weber (2009) on CDS, equity and bonds, both report equities leading credit. The honest formulation is that spread widening sometimes precedes, sometimes accompanies and sometimes follows equity weakness, depending on horizon, episode and whether the question is about one firm or the whole market. So this analysis describes credit conditions alongside equities and does not claim to flag deterioration before stock prices.
The low / moderate / elevated / high labels are thresholds of our own.
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