The S &P 500 closed down 20% from its peak of 4800+ over the past 5 months. Financial headlines trumpet words like “crash” “bear market”, “extreme fear”, and “volatility“. Red is the predominant color on financial news service websites. Is it time to panic sell all your equities? Should you go all in on the US Stock market?
First: Don’t Panic
OK, take a deep breath. Don’t panic. 20% drops actually happen rather regularly. The current drop happened over a period of about six months. `Here’s an image showing the distribution of S & P 500 price changes for 6 month intervals.
Histogram of 6 month market returns
The light red dashed line is at -10% or “correction” territory. The dark red dotted line represents -20% or the threshold for a “bear market.” Look how much of the distribution remains to the left of both of these lines. Neither event is uncommon. In the histogram, I also highlighted the 0% line in solid blue. Take heart doom and gloom fans: most of the distribution is to the right of that solid blue line. That means that most of the time, the market has a positive return.
Let’s look at the same data differently so we can more easily quantify how often to expect a -10% correction and a -20% bear to occur within a 6 month window. Corrections happen about 10% of the time. That 20% bear market line happens about 3% of the time. There’s a reason why people smarter than me have said that over time, “it always goes up .”
Cumulative distribution of 6 month market returns
Second: The Market Isn’t That Cheap Yet
Believe it or not, we’re not at bargain basement prices yet either based on two widely accepted measures of aggregate market value.
1) the “Buffet indicator“, which looks at a country’s total stock market’s price relative to the economic output of that country. Economic output is usually measured as Gross Domestic Product. Here’s a detailed discussion if you want some real gory stuff. While the current market conditions have improved from late 2021/ early 2022, valuations are still relatively high.
2) the Cyclically Adjusted Price to Earnings ratio (CAPE) or Shiller PE is another measure of long term value. It too is still high by historical standards despite recent sell-off. As of this writing, the Shiller PE is above 30 against a long term average of about 17.
Of course, I don’t have a crystal ball that sees into the future. However, based on measurements like these that show some good predictive power with long term stock market returns, it might make sense to make a measured response.
How to Respond to a Market Downturn
With a 20% drop, your asset allocation is likely out of balance. you can think of the market on sale and consider this an opportunity to re-balance. Sell some bonds and buy some stocks to bring your asset allocation ratio back to your goal.
Continue investing regularly or dollar cost averaging. Stay the course and try to avoid any drastic action. You’re investing for the long haul. As we’ve seen above, dips happen regularly.
If you have low enough expenses, consider investing some extra funds while prices have reduced. I would be cautious of going all in at this time though.
Stay diversified. It’s tempting to think we’re able to pick individual winners. For most investors who aren’t spending their free time reading prospectuses our scouring the headlines for information about a company, buy the entire market (or at least a big chunk of it) and ride the tide.
Disclaimer: While we have a passion for providing entertaining, informational, and possibly useful articles about personal finance, we’re just random people on the internet with no formal credentials or expertise. Talk to a licensed professional advisor if you need advice.
We’re kicking off a new, multi-part series here. We’re going to be looking at several different investment strategies using Monte Carlo Simulation techniques. Our goals with this series are to:
Demystify the Monte Carlo simulation technique.
Objectively evaluate the performance of different strategies against each other.
Learn.
I’m going to drop in our disclaimer right here just to make sure there is no confusion:
Disclaimer: While we have a passion for providing entertaining, informational, and possibly useful articles about personal finance, we’re just random people on the internet with no formal credentials or expertise. Talk to a licensed professional advisor if you need advice.
What Is A Monte Carlo Simulation?
Monte Carlo simulations attempt to show how a system responds through the use of repeated, random sampling of a model of that system. In observing how the system responds to a range of inputs, we can make better decisions in real life. We would like to see if we can learn about how well different investment strategies performed so we can make decisions about what to do in the future. Check out wikipedia and investopedia for some more detail on Monte Carlo Simulations.
While this post/series is not a comprehensive overview of the topic, a brief introduction is useful. Remember the “Normal” distribution from your first statistics class? If not that’s OK. My first statistics class was traumatic too. It represents a range of values/probabilities that we’re likely to see in many systems. Here is a distribution that represents the US Stock Market’s annual returns:
1000 samples of annual US stock market returns from a distribution with mean of TBD and standard deviation of TBD.
For Monte Carlo Simulation, the distribution is at the heart of everything. It is our representation of the system. The underlying distribution tells us how often we expect to see a given result. Finally, it is also fundamentally based on assuming that the general shape of the past can give us clues to how the future will look. How?
We iteratively and randomly sample points from the distribution. In our case, this provides a hypothetical sequence of returns for that asset class. If we’re simulating a 30 year retirement, we need 30 points from each asset. We’re using a distribution rather than actual historical sequences like cFireSIM. Therefore, we can simulate an infinite number of sequences. Let me be clear: that’s not a knock against cFireSIM. It’s actually one of my favorite tools and an inspiration for a lot of our work here.
What does a Monte Carlo Simulation Look Like?
Next, let’s look deeper at the first 5 points sampled from this type of distribution. We will illustrate how we can start to build up a sequence of returns. Remember, these 5 points are randomly drawn from the same distribution. Think of them as the first 5 years of a single “run” representing one potential retirement reality. Below, each panel shows a new point being randomly generated from the underlying distribution and added to the prior sequence.
Five successively chosen points from an underlying distribution.
Next, we can extend the sequence to 30 points (or any number) to represent a single retirement “run.” The next plot shows three such runs. Remember, we drew 3 sequences of 40 points from the same underlying distribution. And, the underlying distribution represents the annual performance of the US stock market. Therefore, you can think of this as three potential retirement experiences.
Three simulated “runs” of randomly generated sequences of returns.
When you make thousands of such multi-decade “runs”, you start to see the range of potential outcomes from this portfolio over time. And, that’s the foundation of our Monte Carlo simulation. We iteratively sample from the historical return data. We then simulate thousands of 20 year, 30 year, or 40 year (or more for those in the FIRE community) return sequences. Finally, let’s put the whole thing together and illustrate our 3 runs from above against a fuller population of simulation data.
In this plot, we simulated 1000 runs and then took the 10th to 90th percentile of those runs within a given year. We’re essentially eliminating some of the less likely returns from the summary. This reduced population forms the grey band in the graph. Overlaid on top of that are the three runs from above. Notice how many individual points are well outside of the grey bands. That’s important: any individual run can have some pretty extreme values (March of 2020, anyone?), but when you look at expected values they’re frequently less extreme. Are those extremes possible? Yes! But, they’re also less likely to occur.
Three 30 year simulated runs highlighted against the 10th -90th percentiles (grey band) of a 1000 run Monte Carlo Simulation
If you had two distributions, one that represents the annual performance of the US stock market, and another that represents the annual performance of the US bond market, you could start to build a model of their respective performance over time. From there, we can start to compare how well different portfolios perform…but we’ll dig into that another time. For now, let’s look at one caveat of many simulations: the shape of the underlying distribution(s).
Pitfalls of the Normal Distribution
In many systems, the normal distribution is a good fit for the underlying data. Stock market performance is not one of them. Here’s a great discussion on the topic. The key phrase is, “fat tails”. Over time, people observed that the stock market sees big movements more frequently than the normal distribution would suggest. This results in errors: differences in the model relative to historical performance. We would like our models to be as right as possible. I need to pause for the obligatory quote from legendary statistician and 20th century Renaissance Man, George Box:
“Essentially all models are wrong, but some are useful.”
George Box
Of course, we would like the models to be as right as possible, especially if we’re going to use them.
Metalogs – An Answer to the Normality Problem
Meta what?
“Metalogs”
They’re flexible distributions that more accurately reflect the underlying data than many of the classic distributions we’re used to (e.g., the Normal). Check them out here. They were invented by Tom Keelin who could be the 21st century’s Renaissance Man. By making distributions that can generate continuous samples from the underlying source data, Tom enabled us to reduce the bias in our original models. He helped us to fatten up our models’ tails when working with stock market return data (and his invention can be useful for modelling in any discipline. Have I sung his praises enough yet?).
Here’s a picture to help illustrate the differences between the actual data and two simulations. We can make 1802 annual return data points from Dr. Shiller’s dataset, called “Actuals” going forward. First, I calculated the mean/standard deviation of the Actuals and used those statistics to generate 1802 simulated returns using the Normal distribution. Then, I fit a Metalog to the original data (a 13-term metalog had the lowest standard error) and simulated 1802 more annual returns using a Metalog based on the actual data. Here’s a Box Plot (yes, the same George Box) showing how the three distributions compare.
Visually, you can see the Actual Returns and Metalog Simulation both have longer whiskers and more outliers than the Normal Simulation.
Wrap Up
That will do it for this first introduction to the topic of portfolio evaluation. It’s a fascinating problem. Inevitably, we will make mistakes along the way. I’m excited to dig into this topic and learn more about it. Hopefully, you have a better understanding of how we’re approaching this idea of portfolio evaluation. In subsequent posts, I will lay out some sample scenarios and start simulating!
Disclaimer: While we have a passion for providing entertaining, informational, and possibly useful articles about personal finance, we’re just random people on the internet with no formal credentials or expertise. Talk to a licensed professional advisor if you need advice.
