The Bloomberg Aggregate Bond Index, the benchmark for US fixed income, has returned 0.11% year to date through August 13th. Zoom out and the picture is similar, with the Agg roughly flat to slightly negative over five years. For an asset class investors hold for stability, that has been a frustrating run, and the natural question is whether bonds still earn their place in a diversified portfolio. We think they do, and the reason has more to do with where we are headed than with where we have been.
The bond market does not drift randomly. It trades in regimes that last years, sometimes a decade or more. At its core, the bond market is where lenders and borrowers come together to fund investment. Interest rates are the level where the two find balance, and each regime is defined by the same underlying question: what is the economy building, and who is financing it?
Regimes are a useful shorthand for understanding the bond market, positioning within it, and interpreting events as they happen. Each of the four examples brought its own opportunities and its own pitfalls. Investor preferences shifted along with them.
Over the past thirty years there have been four main regimes, outside of recessions, as measured against the benchmark US 10-year Treasury, a key rate for both consumer and corporate lending.
The Internet Build-Out (~1995-2000)
The 10-year sat between 4.5% and 6.5%. The economy was laying fiber, building networks, and financing an enormous wave of telecom and technology capital spending. Rates were high because capital was in demand and there was somewhere productive (eventually, in some cases) to put it. This period highlights the idea that investment booms create competition between asset classes for capital, meaning the economy can support higher interest rates when there is enough investment activity to drive growth.
The Housing Era (~2003-2007)
The 10-year traded in a 4% to 5.25% range. Housing became the engine of growth and mortgage securitization became the plumbing. In hindsight, those pipes were filled with some unsavory investments. Mortgage-backed securities in increasingly exotic forms came to dominate new supply, built to meet investor demand for yield. Clearly, investors’ search for yield led them into hazardous areas of fixed income.
The Post Crisis Decade (~2009-2021)
The 10-year spent most of that stretch between 1.5% and 3%, briefly touching 0.5% in 2020. Private investment in this period was weak; the Federal Reserve influenced the market through a series of large market interventions. Investors preferred safety over yield, having overlearned their lesson from the mortgage crisis. There was little competition for capital investment as the economy recovered from the deep recession. Rates were low and falling, which rewarded investors who took interest rate risk.
The AI Boom (2023-Today)
The 10-year yields 4.69% currently, having spent the past three years between 3.5% and 5%. Two forces now push against the low rates that defined the prior regime. The first is the AI buildout, which is enormous and increasingly debt financed. Investment grade corporate issuance is up 27% year over year through July, and JPMorgan projects more than $540 billion of AI and data center related borrowing in 2026 alone, and $4.1 trillion through the end of the decade.
The second is the sheer size of Federal debt outstanding, which requires investors to absorb far more government debt than in prior decades. Together they mean capital is in demand, lenders can ask to be paid for it. Unfortunately, risk hasn’t gone away. The bond market is more sensitive to changes in economic fundamentals than it has been in years. A defining hallmark of the regime may turn out to be a lack of clear guidance from the Federal Reserve, but that story is still in its early days. The market has repriced to a world that wants to build expensive AI infrastructure and finance a growing federal debt at the same time, while also facing inflationary shocks (tariffs, supply chains, demographics, climate change) and less stable geopolitics.
Why Regimes Matter
Two of the four regimes gave way to serious recessions, and in both cases the bond market moved before the economy did. Credit markets became unruly and the yield curve inverted while equity markets were still making new highs. None of that amounted to a usable and tradable signal at the time, but it does explain why we pay close attention to what bonds are doing. The bond market is often where economic stress shows up first.
Every regime tempts investors toward one of two errors. After the financial crisis the error was excessive caution, with investors forced to accept almost no income in exchange for the safety of principal. During the internet buildout and the housing era it ran the opposite way, with capital chasing yield into things it did not understand, whether a new technology or a new financial structure. Today’s market offers real income again, which makes the second error a greater possibility. The discipline is knowing where the risk lies and whether you are sufficiently compensated for bearing it.
Different Regimes Reward Different Approaches
For most of the post-crisis decade, indexing bonds were close to unbeatable. The Fed suppressed volatility through repeated rounds of intervention and rates fell year after year. Most sectors moved together, which left little for a manager to add through sector selection or security research. When the whole market rallies in unison, the cheapest way to own the whole market will do best. Passive was the right call, and low fees mattered more than skill.
The current regime looks different. Corporate supply is heavily concentrated on a single theme. Rate expectations are genuinely balanced rather than one directional. Spreads, the extra yield earned for taking credit risk, are thin in some parts of the market and reasonable in others. The Federal Reserve is signaling it wants to move to the sidelines.
That unevenness is what an active manager needs to be successful. The ability to underweight a crowded sector, adjust interest rate risk as expectations move, and decline to own something simply because it happens to be large in the index has real value now in a way it did not from 2009 to 2021.
How Do You Know the Regime Has Changed?
Regimes are obvious in hindsight and murky while you are inside them, which is why trying to time the shift is not a useful exercise. What is useful is watching the things that define a regime rather than the daily price action: what the economy is investing in, who is financing it, how much new debt is being created, and how much investors are being paid to hold it. Those variables move over quarters and years, not days. Positioning should follow at the same pace.
What Does This Mean for Your Portfolio?
- Your bond allocation should match your plan, not just the market. Higher volatility in rates means the timing of your cash needs matters more than it did when everything moved together. Bonds still serve as the shock absorber in a portfolio, that role has not changed. What has changed is that the characteristics of your bond holdings, particularly how sensitive they are to rate moves, need to line up when you actually need liquidity. Near-term spending should be funded by shorter, more predictable holdings. Longer horizons can absorb more interest rate risk in exchange for higher expected returns.
- Cash is not the whole answer, tempting as it looks. Money markets give you income only with no possibility of appreciation. A bond portfolio locks in today’s yield for years and may gain price appreciation along the way. Core fixed income can also rally when the economy stumbles, offsetting risk elsewhere in the portfolio. Cash cannot.
- Consider active management. This is not a claim that active always wins, because it does not. It is a judgment that a regime defined by concentrated supply, uneven performance between sectors, and a real two-sided debate about rates is one where choosing what to own matters more than it has in fifteen years. A passive bond fund lends the most money to the biggest borrowers, whoever they happen to be, at whatever price the market sets.
Where This Leaves Us
Bonds have had a difficult few years, which is what transitions usually look like from the inside. The last regime ended, with yields at all-time lows meant that the transition to higher rates would be challenging.
But the reason this one has been painful is the same reason it is worth being patient. Yields are higher because capital is genuinely in demand, and higher yields are not a headwind once you own them, they are the return. For the first time in roughly fifteen years, bonds are being paid to do the job we ask them to do, which is to generate real income and to hold up when other things do not.
The work now is understanding where that income comes from. Extra yield always has a source, and it is not evenly distributed or evenly compensated across all areas of the bond market. History has taught us that some bonds reflect risk worth taking and some do not. Sorting one from the other is the difference between owning bonds and simply holding them.
Sources:
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Bloomberg, JPMorgan Sees AI Buildout Costs Totaling $5.5 Trillion by 2030, June 2026.
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Bloomberg, JPMorgan Boosts Tech Bond Sales Outlook as AI Debt Binge Expands, Accessed in August 2026.
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Bloomberg Finance, Accessed in August 2026.
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