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As retail investor surveys show money continuing to rotate from stocks to bonds - despite sky-high bond prices and their associated ultra-low interest rates - there is increasing concern that investors may soon be blind-sided by at best a savage bond bear market, and at worst a bond bubble that pops. But are investors really buying into bonds because they're bullish on bonds, or because they're bearish on stocks with few appealing alternatives?

After all, if there really is a bond market bubble that's going to pop, the precipitous rise in interest rates could do even more harm to stock prices than bond prices, both from the relative value perspective (who wants to buy the S&P 500 at today's 2% dividend yields when bonds pay 6% again?) and from the economic perspective (a sharp rise in interest rates isn't exactly bullish for economic growth!).

Which means the reality may be that today's bond buying is not about hunting for return in bonds, but about managing the risk of equities (and/or other risk assets). Of course, if the investor really thought the popping of a bond bubble was looming, the best decision may simply be to go to cash. But given the uncertainty of timing, the next best choice for the bearish investor: stay invested, tilt the portfolio towards bonds (and likely shorten duration), and wait and see. Who knows, maybe rates will manage to go even lower from here, as they have 'surprisingly' done for the last 3 consecutive years!

For the past several years, as bond rates continue to grind lower and lower, more and more investment pundits have declared that bonds – especially US government bonds – appear to be in “the mother of all bubbles” and that bond carnage will soon be forthcoming if/when/as interest rates inevitably rise. As a result, it is often suggested that investors should reduce their allocations to bonds, and increase their allocation to stocks, which have a better expected return than the near-0% (or potentially negative return) on bonds.

Yet the reality is that upon further scrutiny, this argument doesn’t appear to hold much water. If an investor truly believes that bonds are a bubble that’s about to pop, the optimal allocation wouldn’t be to buy stocks instead; it would be to go to cash!

Stock Valuations And Relative Rates

One of the fundamental reasons why many of those who declare that bonds are in a bubble recommend stocks are because of the relative value opportunities – simply put, why buy a 10-year government bond yielding 1.6% when you can buy the S&P 500 yielding 2%+ and get the appreciation potential of stocks from there?

Yet imagine what happens if there's a bond bubble that really does pop, and interest rates lurch sharply upwards. Imagine a world where the 10-year bond goes from 1.6% back to a "healthier" historical rate like 6%. In that environment, stocks yield 2% and bonds yield 6%. How many investors, after being yield-starved for nearly a decade, would really still hold stocks at 2% when they get could less volatile, more secure bonds at 6%? Certainly a few would, but to say the least, it would be far fewer than today... which means a lot of selling pressure.

The net result – a jump in bond rates could easily draw money out of equities, and actually accelerate the net outflows at an even higher pace than what we’ve seen for outflows in many of the past months (not to mention the cumulative 33-times-as-much money that has poured into bonds relative to stocks since December 2007), until stock prices fall to the point where equities are once again appealing when compared to a 6% yield on the 10-year government bond. Or stated more simply: a crash in bond prices and an accompanying jump in bond yields could actually cause or exacerbate a severe bear market in stocks! And in a severe bear market, the stocks could/would lose even more money than the bonds!

The Economic Impact Of A Bond Market Popping

Unfortunately, a precipitous rise in interest rates has economic consequences, too. Borrowers would face higher financing costs, which could/would slow economic activity, from residential real estate to mergers and acquisitions. Private business investment and growth would slow, as higher borrowing costs drive up the hurdle rate for making new projects appealing and actionable in the first place. Businesses and individuals that must refinance debt may find themselves cash flow constrained at higher interest rates (or unable to afford to roll over debt at all!). Not to mention the attendant economic consequences of a potential spike in the Federal budget deficit as short-term government debt rolls over into higher rates and drives up the government's interest servicing costs.

All of which suggests that if the bond market is a bubble that pops, the impact on equities won't just be one of relative value. Just as the Federal Reserve has driven rates down to help stimulate the economy, so too would a dramatic rise in interest rates slow the economy. In other words, it's hard to imagine a precipitous rise in interest rates that isn't accompanied by an economic recession. Which in turn means there's another reason why a bear market in bonds could lead directly to an even uglier bear market in stocks!

Bonds Versus Stocks - Relative Return Or Relative Risk Management?

Given the relative valuation and economic consequences that a sharp rise in interest rates would have on equities - potentially causing an even more severe loss than "just" a bear market in bonds (at least for bonds of limited duration) - it seems entirely possible that the cash flows moving into bonds in today's environment are an entirely rational decision: to invest for risk management, not just for returns.

In other words, stocks may be more appealing than bonds at current rates and in the current economic environment, but if you really believe interest rates may soon rise, you're actually forecasting that bonds will soon become more appealing - if only because they will be losing less than the stocks, especially for investors who acknowledge the risk in bonds and keep the duration relatively short.

That may not be a terribly appealing investment position - and certainly some bond investors probably fail to realize the risks and will be surprised when bonds don't merely perform as a higher-return-cash-alternative - but for investors who do want to stay invested in something and not go entirely to cash, it's still a remarkably rational choice for the lesser of two evils. And in turn, this means that as investors increasingly fear rates might rise, the pace of money flowing into bonds could accelerate further - because of the ominous sign it would bear for stocks!

Avoiding The Bond Bubble Entirely?

What all of this means is that for investors who truly fear a looming bond bubble, and want to avoid losses, the correct place to go is not equities or other risk asset classes, but to cash (or at least to drastically shorten bond duration).

The caveat, of course, is that cash yields next to nothing. Putting money there waiting for a bond market bubble to burst dooms the portfolio to a slow steady grind of inflation and negative real returns, waiting for the disaster to come, but not knowing when it will arrive. Which means, at the margin, at least getting a little yield in bonds, with a reasonably low duration and/or with an appropriate bond ladder, not knowing quite when the bond market may burst, is still relatively appealing. 

And in reality, that's the purpose of the monetary policy currently being implemented by the Fed: to try to drive investment dollars to investment uses by making the return on cash so unappealing that investors will feel compelled to allocate their dollars 'more productively' (to bonds and/or stocks). Which ironically means that stocks are really only appealing as long as you think the Fed and the bond market can continue to maintain these rates, or even lower rates. If you think the bond bubble's time has come, it will be time to clear out entirely. On the other hand, sometimes the process takes far longer than most people expect. Just look at the bond market for the past several years, as many have insisted that the bond market is a bubble that will soon pop, only to see interest rates go lower. And lower. And then ever lower. Or look at Japan, which has continued to embarrass one bond bear after another for the better part of two decades.

Thus, while it's still true that unsustainable trends are, ultimately, unsustainable, it still doesn't mean today's bond investors are nuts. Perhaps they're just being savvy investors acknowledging that it's not wise to reach for return in the face of a risky environment for stocks and bonds, and instead are staying the course while playing a little defense, and avoiding the adverse consequences of just sitting in cash waiting for a day that may still be a long time coming.

(This article was included in the Carnival of Personal Finance #390 on Investing Answers, the Carnival of Financial Planning on Master The Art Of Saving, Nerdy Finance #18 on NerdWallet, the Wealth Management Carnival #8 on Marotta on Money, and also the Carnival of Retirement on Vane$$a's Money.) 

  • Kay Conheady

    I’ve been telling my clients this exact message for over a year now. It is reassuring to see that there are others who have the same perspective.

    I get especially annoyed with commentators who talk endlessly about what will happen to bonds when interest rates go up (in 2015!). They say nothing about what will happen to the STOCK market when this happens…a market that is currently artificially propped up by ultra low interest rates. Readers beware!

    Thanks again for the well rounded take on this important topic.

  • tom brakke

    This is a good topic for investors and advisors to examine. A few thoughts with some further readings if you have an interest:

    A rising interest rate environment is likely to have disparate effects on parts of the asset classes that we lump together as “stocks” and “bonds.” Evaluating scenarios (and not just those in the history book) is very important right now. A place to start is with “the big question”:

    To Kay’s parenthetical comment about rates rising “in 2015!” — the Fed has no earthly idea when it will change its rate policy. It is manipulating investor risk preferences rather than forecasting. It has been dead wrong many times and will be again. Don’t rely on its statements for your investment policy.

    In any case, the market is way bigger than the Fed. If the market gets spooked about inflation or something else, the Fed will go from dictating the interest rate regime to almost powerless to affect it for a period of time. That’s the way it always works. (It will also likely be behind the curve at first:

    The cash question is key. A scenario analysis should examine the potential downdrafts in risk assets versus the issues with cash that Michael mentioned. But don’t avoid it for the wrong reasons; cash has unique optionality. (For more on that idea, check out this piece from the CFA Institute:

  • John Leske


    I think a question you haven’t asked in your analysis is “Why would interest rates go up?”. Presumably, because inflation and/or economic growth are higher than expected, that may have very positive implications for stock markets and debt holders.

    However, as a financial planner, I would not enter into a debate regarding whether clients should hold cash, bonds or stocks based on my or anybody else’s short term return expectations. I tell clients I’m a financial adviser, not a fortune teller.

    Your article caused me to review a Blog article we wrote over two years ago asking “Is there a bond market “bubble”? . Nothing that has happened since then would cause me to alter our final remarks, that I quote below:

    ” We don’t think it makes sense for smart long term investors to try to outguess the market. Rather, they should understand that the primary purpose of holding defensive assets, like government bonds and managed bond funds, is to reduce overall portfolio volatility rather than to enhance returns. We think you should hold government bonds and other high credit quality fixed interest investments for the stability and financial security they offer, rather than because you’re “aiming to shoot the lights out”.

    So, the important decision is not so much whether bond yields will go up or down, but what percentage of your investment portfolio should be held in defensive assets i.e. the asset allocation decision. The decision should be made after consideration of:

    • Your attitude to risk;
    • Your need for risk; and
    • Your capacity for risk.

    Once the decision is made and implemented, should you find that you become overweight in defensive assets due to favourable movements in government bond yields and/or falls in growth asset values, it may be appropriate to reduce your defensive holding. But this would reflect disciplined rebalancing of your portfolio, rather than a view that there was a bond market ‘bubble’.”

    John Leske

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  • Robert Wasilewski

    I disagree. I think investors chase returns and the returns on bond funds have been great whereas early 2000 and 2008 equity market performance still have investors spooked. Investors don’t understand the difference between return and yield. Push up the 10 year Treasury yield to 5% and there will be a rush for the exits and fund inflows will reverse in a big way. In the early 1980s the 10 year Treasury note yielded up to 15% and the coverage in the auctions was extremely poor. This of course was a period where bond fund returns were horrible.
    I continue to believe the bond market is irrational ( a bubble waiting to burst) and investors should be mindful they are being paid to take duration risk, i.e. lighten up on or avoid Treasuries. Investors should,however, remember Keynes’ comment “the market can stay irrational longer than you can stay solvent”.

  • Avi Oren

    Hi Mike,

    I assume that this dicussion does not apply to balanced funds in which the managers pick the assets, and do the rebalancing, such as the Vanguard Wellington and the Wellesley Income funds. Most retirees (DIYs) on the Morningstar discussion forums use such funds. Your suggestions might imply the exchanging of the fixed- income portion in those balanced funds from bonds to cash or to short term bonds, which only the managers could do. The other alternative for investors would be to avoid such balanced funds, for the short term. Do I make sense?

    Avi Oren,retired CFP,MBA,M.Sc.

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  • Michael Kitces

    Thanks for the comment, and sharing the CFA Institute article. I’ll take a look!
    – Michael

  • Bob Seawright

    Hi Tom — I appreciate the analysis (as always). My preferred approach at the moment is hedged equity. The Fed is trying to push people to risk assets and the Fed is tough to fight. Why not capitulate but hedge?

  • Frederick Dunn

    Thank you, John Leske, for your balanced reasoning.

    The broader matter to which you responded reminds me of so many recent trends in financial circles. We seem to have shifted over the last several years from greed to its equally evil twin, fear.

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Michael E. Kitces

I write about financial planning strategies and practice management ideas, and have created several businesses to help people implement them.

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