Financial conditions are tightening. Here's why stock investors should pay attention.

By Michael Kramer

Widening credit spreads around the world are a sign that how stocks are valued may be changing, for the worse

Interest rates are increasing around the world.

If central banks are going to succeed in bringing inflation back to target, financial conditions will have to tighten. The problem for investors is that, while conditions remain remarkably loose enough that stocks are climbing despite several concerns, some markets suggest that is about to change.

Financial conditions eased considerably after peaking in late 2022 and early 2023, as interest rates fell and credit spreads tightened materially - not just in the U.S., but globally. However, early signs suggest this is changing. As central banks start tightening policy, sovereign and credit spreads should begin to widen.

Credit spreads refer to the spread between low-risk government bonds and lower-rated, riskier bonds of equivalent maturities. How spreads change can signal financial-market conditions, as narrower spreads suggest investors are willing to take on more risk as liquidity is plentiful, while widening spreads are a sign that investor worries about liquidity are growing.

Central banks are tightening up

The European Central Bank, for example, has already raised interest rates twice in 2026 and is expected to raise them further in the next few months. This is already affecting rates in Europe, as yields rise to reflect tighter monetary policy and higher inflation, leading to wider spreads.

Over the past 15 years, the spread between Italian 10-year and German 10-year rates has been one of the wider sovereign spreads in Europe. But even that spread fell to extremely tight levels. The two 10-year interest rates hadn't been so close since before 2009. The wide spread may have been a lingering artifact of the Eurozone debt crisis that followed the financial crisis, but either way, it has started to widen.

One reason we care about these sovereign spreads is that they tend to move similarly to the iTraxx Europe Crossover Index, which measures the cost of insuring a basket of European high-yield corporate debt against default. When both widen, it signals tightening financial conditions.

These spreads in Europe also have a strong relationship with U.S. investment-grade and high-yield credit spreads, tracking similarly to the Markit CDX North America High Yield Index.

So, when credit spreads begin to widen, they tend to widen together, which reflects the transmission of monetary policy and the transfer of risk through markets. The more the Fed and other central banks aim to tighten policy, the more likely it is that spreads should widen further.

Equity investors may think credit spreads do not matter to them. But credit spreads matter a great deal to the stock market because they can affect how prices in relation to earnings - the price-to-earnings ratio - are valued.

When credit spreads widen, the earnings yield of the S&P 500 SPX tends to rise right along with them. The S&P 500 earnings yield is simply the inverse of the S&P 500 price-to-earnings ratio. Right now, the S&P 500 earnings yield has already started to rise, while U.S. credit spreads have barely moved, which could be an early warning that they have considerable room to widen.

Tighter financial conditions also tend to mean higher measures of implied volatility.

The MOVE Index, which measures bond market implied volatility, tends to move with credit spreads, as well as with the earnings yield of the S&P 500.

As the effects of monetary policy grow stronger, the S&P 500's P/E multiple could contract further. How much it contracts depends on how much financial conditions tighten and how quickly inflation falls back to central banks' 2% targets.

If the Federal Reserve, ECB, and other central banks need to tighten policy significantly or need to see financial conditions return to 2022-type levels, then we are merely at the beginning of the cycle, and will have much further to go.

That is ultimately why all of these markets are connected. In the end, the entire market is the same trade, and changes in stock prices are just another way to measure financial conditions. Right now, stock prices suggest financial conditions are still far from tight.

Michael Kramer is the founder of Mott Capital Management and a long-only investor focused on macroeconomic themes. He analyzes long-term macro trends and short-term market risk using technical analysis, fundamentals and options-market positioning. See here for further disclosures.

-Michael Kramer

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09-22-26 0748ET