What is Survivorship Bias?

Posted On August 15, 2024 By Scott Stratton, CFP(R), CFA In Portfolio Management /

Survivorship bias is the problem that the track record of today’s stocks reflects only the ones that survived. The stocks and funds which failed are no longer part of the performance history of today’s stocks or mutual fund databases. And as we will see, over the years, there have been a lot of stocks that have had bad returns and disappeared. We will also discuss how to invest wisely given the reality of survivorship bias.

Growing up in Rochester NY, my neighbor on the left worked for Eastman Kodak. Our neighbor on the right worked for Kodak. And all three neighbors across the street worked for Kodak. Kodak Park was the largest industrial site in the world, stretching for miles along Ridge Road. Rochester was a company town and there was tremendous pride in Kodak. The stock had done well for employees and residents, the company contributed a lot to the community, and the pension plan provided security to tens of thousands of retirees.

Kodak, the stock, was part of the S&P 500 Index and was one of 30 components of the Dow Jones Industrial Average from 1930 until April 2004. The company actually invented the digital camera in 1975, but thought it would be too impractical to ever have value. The rest, as they say, is history. The company had a long decline into obsolescence and filed for bankruptcy in 2012. The once mighty stock went to zero.

Stock Market 1926 through 2023

A new research paper by Hendrik Bessembinder looks at US stocks from 1926 through 2023, a 98-year period. During this period, there were a total of 29,078 US-listed stocks. Today, there are around 5,000. He looked at the performance of these stocks and it is a remarkable picture of Survivorship Bias.

Only 31 stocks have been in existence for the entire 98 years. The average stock existed only for 11.6 years. Approximately 24,000 companies have disappeared: either bankrupt, merged, acquired, or taken private.
51 percent of the stocks had negative returns over their entire life, with a median compound cumulative return of -7.41%. Most stocks lost money!
Thankfully, the compounding effect of the winning stocks greatly offset the stocks which lost money. The mean performance is much better than the median performance of the 29,078 stocks.
If you randomly select 10 stocks from history, your chance of outperforming the S&P 500 is very small. That is because most of the wealth creation in the market comes from a small percentage of top-performing companies. The majority of stocks under-perform the index.

Idiosyncratic Risk

Eastman Kodak, Lehman Brothers, Enron, and General Motors all went bankrupt and their stocks went to zero. Even though the stock market has done well over the long-term, there are still many individual stocks that get destroyed. We call this Idiosyncratic Risk, or “company specific” risk. Unfortunately, even if you do your homework, investors risk being caught in the next Bear Stearns or Washington Mutual.

What can you do to address Survivorship Bias and reduce the Idiosyncratic Risk of individual stocks?

Diversify extensively with index funds. While single companies do go bankrupt, we have never seen all 500 companies of the S&P 500 index go bankrupt at once. An index fund can greatly spread out your risk. Recognize the difference between speculating on an individual company versus investing in the market as a whole.
Note that index funds are not static. Every year, the S&P 500 Index adds growing companies and drops other companies which are on their way down. Sure, there are still surprises where an S&P 500 company disappears suddenly (like Silicon Valley Bank last year), but you still have 499 other holdings.

Fund Shenanigans

It’s not just individual stocks that exhibit survivorship bias. Mutual Fund companies do the same thing, deliberately getting rid of their worst funds. A fund with a poor track record eventually gets so small that it is unprofitable, and the fund company shuts it down. Even more nefarious, companies create dozens of stock funds and then take the ones with a poor track record and roll them into their funds with better ratings. The crappy fund disappears and now it looks like all their funds are 4-star and 5-star funds!

You might think the solution is to avoid the mutual funds with a poor track record and go with a top ranked actively managed fund. Unfortunately, we know that performance is rarely consistent with actively managed mutual funds. Is that my opinion? No, this is what decades of data shows from the Standard and Poors Persistence Scorecard. For example, there were more than 2000 US stock mutual funds in December 2019. The top quartile (the top 25%) included 529 funds in 2019, but not a single one of those funds remained in the top quartile over the next four years, through December 2023. Past performance (you should know this by heart by now) is no guarantee of future results.

One of the consistent findings of the S&P Persistence Scorecard is that the worst performing funds are the most likely to merge or be shut down. And then you can’t find those one-star funds on Morningstar because they no longer exist. That’s survivorship bias. Our approach: use low-cost index funds from Vanguard, SPDRs, and others. Then we are not chasing performance, looking for the hot fund, sector, or country. And we have been saying for a long time: the vast majority of active managers under-perform their benchmark over time.

Keeping It Simple

The stocks which exist today are different from the ones from 98 years ago. Companies come and go. Survivorship Bias masks the poor track record of the many stocks and funds which have disappeared. When we only see the ones which survived and thrived, investing success looks easier and more inevitable than it really is. Unfortunately, there are stocks and funds out there today which will someday suffer the same fate as Eastman Kodak and thousands of other past stocks. Understanding this history will help you be a better investor in the decades ahead.

How can we reduce Idiosyncratic Risk or Survivorship Bias? Fortunately for investors, this complex question has a simple answer. We can diversify and reduce the importance of any one stock in our portfolio. With index funds, we get broad diversification, with hundreds or thousands of holdings, in a low-cost, tax-efficient vehicle. No doubt an index fund will own some stocks that fail, but one stock out of 500 may only move the index by 0.2% for one day. It often is hardly even noticed. And using index funds also helps keep us out of the worst actively managed funds, which sometimes were the best funds from five years ago. These are time tested strategies and the data keeps proving that this approach remains a wise choice for investors.

Should I Add More Bonds?

Posted On November 3, 2023 By Scott Stratton, CFP(R), CFA In Portfolio Management /

Yields have risen on bonds this year and for many investors it may now make sense to increase their bond exposure. Eleven months ago, I wrote how bond yields had actually crossed above the expected return for stocks. At that time, we could find A-rated bonds with a 6 percent yield. And that compared favorably to the 5.7% expected return of stocks, as projected by Vanguard over the subsequent 10-years ahead.

This past month, we bought some new 10-year government agency bonds with a 7% yield. Now it looks even better to be adding bonds and maybe even reducing some of your stock market exposure. Last November, the Vanguard Capital Markets Model suggested a 5.7% expected return for US stocks over the next 10 years. As of mid-year 2023, they have reduced that to 4.7%.

Even though stock predictions are usually very inaccurate, I do think it is worthwhile to look at these projections. While the historical returns of US stocks may have been 9-10% over the long haul, returns can be above or below average for an extended period. There have been many 10 year periods which have done better or worse than the “average”. There are many factors which can help us estimate returns, including starting equity valuations (such as the Price/Earnings ratio), corporate earnings growth, or productivity gains. It should not come as a surprise that when stocks are expensive (like in 2000), the following 10 years are below average. Or when stocks are beaten down and cheap (like in 2009), the next 10 years are often above average in return.

Portfolio Models

We manage a series of investment portfolios for our clients with an approximate benchmark blend of stocks and bonds. Our Premiere Wealth Management Portfolio Models include:

Ultra Equity (100% stocks / 0% bonds)
Aggressive (85/15)
Growth (70/30)
Moderate (60/40)
Balanced (50/50)
Conservative (35/65)

In the 4th quarter of each year, we analyze our portfolio models and make tactical adjustments based on where we perceive relative value. We overweight the segments or categories which have better expected returns and we reduce the categories which have a lower expected return. In addition to our Core holdings of Index Funds and investment grade bonds, we consider satellite investments in alternative categories.

But this year is different. We are now looking at bond yields that are above the expected return of US stocks. I think it may make sense for a lot of my clients to consider a healthy increase in their bond holdings. For the last 15 years, since the 2008 global financial crisis, bond yields have been absurdly low. Today, we have a chance to lock-in longer yields at a time when the stock market looks potentially mediocre for the next several years of returns.

I have thought for a long time about how to increase bond holdings. If we move a 60/40 portfolio from 40% to 50% bonds, we probably shouldn’t still call it a 60/40 model. So, instead of making large changes on the model level, I will be discussing with each client if we now want to consider reallocating from the 60/40 to the 50/50 model, for example.

Pro / Con of Adding Bonds

The hope, by adding more bonds, is to reduce volatility and have a smoother, more consistent return each year. If the 4.7% expected return of stocks is correct, bonds could out-perform stocks and improve the return of the overall portfolio. For investors close to retirement, adding bonds could reduce the impact of a large drop in stocks, right before income was needed. And for retirees taking distributions, the now high income from bonds means we can better meet your need for cash flow versus selling shares of stocks.

Of course, there is no guarantee stocks will under-perform as projected. The 10 year projection from Vanguard is an annualized average – the stock market will undoubtedly have years with very different performance than the annual average. Investors with FOMO may be unhappy in bonds, even 7% coupons, if stocks are up 20% in one year. Young investors who are making monthly deposits may prefer dollar cost averaging and not worry as much about stock market fluctuations.

Understand Callable Bonds

Many of the Agency, Corporate, and Municipal bonds available today are “callable” bonds. That means that the issuer has the right to pay off the debt early. “Calls” happens when interest rates fall and the issuer can replace their 7% debt with a lower yield bond. It’s just like refinancing a mortgage to a lower rate.

We don’t necessarily have to hold a 10-year bond to maturity. Here is how past economic cycles worked: Eventually, the economy will slow and fall into recession. At some point, the Federal Reserve cuts interest rates and we often see both short and longer term interest rates drop. At that point, the issuer of the 7% bond may be able to refinance down to 6% or 5%. So, they will call their bonds early and redeem them at full value.

If we are in a recession, it’s also possible that the stock market could be down 20% or more in that period. And that may be a good time to rebalance – to take the proceeds from the called bond and invest it back into a stock market that is beaten up. That certainly worked well in March and April of 2020. If interest rates drop, we are likely to get called and might not be able to find another 7% bond. But that may be okay, if we are willing to rebalance the overall portfolio and buy other investments when they are on sale. And of course, regardless of when a bond is redeemed, we made 7% a year, since we bought these bonds at Par.

Reducing Call Risk

Why not just buy non-callable bonds? I would if they were more available and at the same yields. Most bonds today are callable, with the main exception being US Treasury bonds. But the yield on the 10-year Treasury is 4.7%, not 7%. So, I am willing to take some call risk for the extra 2% in return. Still, there are some things we are doing:

Buying discount bonds. Older bonds with a lower coupon often trade at a similar yield to maturity as new issue (and high coupon) bonds. These are less likely to be called. And if we buy a bond at 90 and they call it at 100, that is great.
Preferred Stocks are also now trading at sizable discounts, often 60-70 cents on the dollar. If we are comparing a bond from Wells Fargo versus their Preferred Stock, there may be advantages of the Preferred. While they may have similar current yields, the preferred has upside to its $25 price. The bonds, trading near Par, have no price appreciation potential.
Fixed annuities (multi-year guaranteed annuities or MYGAs) generally are not callable. And since there is no 1% management fee on the annuity, a 5.5% 5-year annuity may net the same return as a 6.5% 5-year corporate bond. Except the annuity is guaranteed, unlike a corporate bond. So, if you aren’t needing flexible liquidity, MYGAs can reduce your call risk and lock in today’s interest rates.

Your Bond Strategy

We’ve waited 15 years to have bonds with these juicy yields. I think now is not a time to be too defensive with a money market or short-term T-Bills. Those are fine for your immediate needs. But at some point in the future, rates could drop. The risk is that when today’s 5.5% T-Bills mature, the new T-Bills might only yield 3% or 2%. Then we will regret not locking in the longer duration yields available to us now at the end of 2023.

These last four years have been quite a roller coaster for investors. A huge crash in March of 2020, followed the fastest recovery of stocks ever. Then unprecedented inflation. A Bear Market in 2022 brought a 20% drop. A recovery in 2023 that was limited only to a handful of tech stocks. A lot of stock funds have little or almost no gains to show for all this commotion. Stocks have been disappointing.

Bonds today offer a higher yield than the 4.7% expected return of US stocks over the next decade. That’s quite a shift and investors should pay attention – yields will not stay at these levels forever! We are always cautious in making large changes, but would generally prefer bonds over stocks if they had the same return.

Stocks are supposed to have an Equity Risk Premium to compensate you for their added risk and volatility. Not today. Bonds offer lower volatility, a more predictable return of “yield to maturity”, and current income. For retirement planning, these are very desirable qualities that can improve the outcomes of our planning simulations both before and during retirement years. These are the reasons will are looking to add more bonds today.

Coronavirus Stock Market Damage

Posted On February 29, 2020 By Scott Stratton, CFP(R), CFA In Behavioral Finance /

Welcome to the Coronavirus Stock Market. After setting an all-time high on February 19, the market plummeted last week, and is down nearly 15% from its highs. As the virus spreads, the economic impact is growing. Companies are sending employees home, shuttering manufacturing, leading to less travel, less restaurant meals, and lower consumer spending.

As an investor, what should you do, given that we don’t know how much worse the contagion will grow? I don’t know. No one knows. No one has a crystal ball to know how the disease will spread or how the economies or markets will be impacted. Recognizing that this is unknowable information is the key to understanding what to do.

A history lesson may help. Big drops of 3.5% in a day are somewhat rare and they are felt as being quite shocking. We had a couple of days like that this week. Over the past 33 years, there have been 55 days of a 3.5%+ drop. In 45 of those instances, the market was higher 12 months later. Much higher, on average 20% higher. In only 10 of 55 drops was the market lower a year later. (Source: Barrons) Those aren’t bad odds, and the reward for staying invested could be worthwhile.

What I did this week

If it helps, let me share what I did in my own portfolio this week. I did not sell anything. However, I did have a couple of bonds which were called. With the new cash in my account, I revisited my asset allocation. Since equities are down, I was presently underweight to my target percentage of stocks. So, I purchased more shares of stock Exchange Traded Funds (ETFs) that I own.

Sure, it’s possible that the purchases I made this week will be even lower next week. But I’m not trying to time the market. No one can tell you when the Coronavirus stock market carnage will cease and it will be safe to invest again. We are stuck with uncertainty no matter when we make a decision. So the optimal decision, I think, is to stick to a disciplined process. Create a diversified target asset allocation and hold that portfolio regardless of epidemics, elections, wars, or any other human events. Rebalance your portfolio periodically, when you have cash to add, or when your allocation has shifted.

If you made any recent purchases in taxable accounts, consider harvesting your losses. Immediately repurchase another fund to maintain your target allocation. This is solely to lock in a capital loss for tax purposes, so be careful to not change your asset allocation.

The Pain of Losses

There’s an old saying on Wall Street that stocks take the stairs up but the elevator down. Gains are slow and plodding, but losses are straight down. That’s definitely what happened this week. From a psychological perspective, the pain of a 10% loss is more acute than the thrill of a 10% gain. This increases likelihood of making investment errors.

Everyone agrees that we shouldn’t try to time the market when the market is rising. But when the market is down, we have to really resist the urge to go to cash, when our amygdala is screaming Run! Hide! Get out of the market before you lose everything! That biological mechanism may have helped our ancestors avoid being eaten by a saber-toothed tiger, but is a detriment to long-term investing.

Bonds and Alternatives

While stocks have been falling, investors seem to be buying bonds no matter how low the yield. As money floods into bonds, prices go up and yields go down. The 10-Year Treasury reached an all-time low yield on Friday of 1.09%. Unbelievable, and yet this didn’t even make any headlines this week. With low rates, expect virtually all of your callable corporate and municipal bonds to get called. And then good luck finding a replacement – I’m seeing 2% yields at 10+ years. That’s terrible for a BBB-rated credit.

This is a good time to refinance your mortgage. If you can save 1 percent or more, it is probably going to be worth the change. That’s just about the only benefit of the low interest rates.

Today’s yields make bonds quite unappealing and dividend stocks more attractive. Some good companies are down significantly (why is Chevron down 25% this year?). We were buying stocks at higher prices last month, and if you like those companies, you should like them even better when they are on sale. Bonds won’t even keep up with inflation and the low interest rates will push more investors into stocks.

Stocks have much higher risks than bonds, and it is simply unacceptable for most investors to be 100% in stocks. Fixed, multi-year guaranteed annuities have better yields than treasury, corporate, and municipal bonds and are also guaranteed. We can get over 3% on a 5-year annuity, versus 0.87% for a 5Y Treasury or 1.6% on a 5Y CD. Annuities remain very unpopular, but I think they are a better fixed income investment than bonds if you do not need liquidity. I suggest laddering fixed annuities over a 5-year maturity, 20% into five sleeves.

Our Alternative Investment in Preferred Stocks were down a couple of percent this week, but nothing like the bloodbath in stocks. Some preferreds that were trading near $26 are now trading near $25. With a $25 par price, this is an excellent entry point for investors.

The Coronavirus stock market impact has been shocking. Investors are not going to be happy when they open their February statements. Realizing that we cannot predict the future, we need to avoid the “flight” response. The challenge for an investor remains to keep the discipline to stick to their plan of a diversified allocation. Rebalance and hold.