Tag: portfolios

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Opportunities from more commission-free ETFs

Earlier this month, Fidelity followed through on its promise made earlier in the year. They now offers over 500 commission-free ETFs. This increase puts them in 2nd place for most commission-free ETFs offered by the five discount brokers analyzed each month by ETFMathGuy. The leader is still Vanguard, with approximately 1,800. Our chart below shows the update for Fidelity’s offering, where the Vanguard count only represents Vanguard ETFs. (We will be updating our Vanguard database soon.)

Vanguard* count only includes Vanguard ETFs. Vanguard now offers approximately 1,800 ETFs commission-free.
Vanguard* count only includes Vanguard ETFs. Vanguard now offers approximately 1,800 ETFs commission-free.

What is the benefit of more commission-free ETFs in a portfolio?

The most obvious benefit is the opportunity to access portions of the market not previously available. I demonstrated this benefit in previously published research entitled “ETF trading strategies to enhance client wealth maximization“. Here at ETFMathGuy, we have seen these opportunities first hand in our optimal portfolios. Each month, we’ve developed portfolios based on the current number of ETFs offered by each discount broker. We have also calculated the expected return associated with these portfolios, and there appears to be a potential opportunity. When constructing portfolios with more ETFs available, we see in the figure below that expected returns generally improve. Note that the pair of dots next to the portfolios are the result of excluding commission-free municipal bonds when generating a portfolio suitable for an IRA.

Expected return of ETFMathGuy optimal portfolios tend to rise with more commission-free ETFs available

More commission-fee ETFs may not always be beneficial

This figure shows that having more options to invest can improve the likelihood of generating higher returns. But, the additional ETFs must be sufficiently different those that are already offered. They must also have the potential to generate higher returns. Ameritrade seems to be accomplishing the most with their approximately 300 ETFs. Conversely, ETrade offers many more ETFs than the 59 offered by Vanguard, but doesn’t appear to increase expected returns by much in the portfolios constructed by ETFMathGuy .

ETFMathGuy is a subscription-based education service for investors interested in using commission-free ETFs in efficient portfolios.
ETFMathGuy is a subscription-based education service for investors interested in using commission-free ETFs in efficient portfolios.
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Using diversification to deal with market volatility

A recent Wall Street Journal article discussed the behavioral aspects caused by market volatility. The article nicely summarizes the long term view of the market. Based on historical analysis, there is a 2% drop in the stock market every 33 trading days, on average. With the Dow at its current levels, that is a 520 point drop every 6 weeks or so.

If this amount of volatility is “keeping you up at night”, perhaps your portfolio isn’t properly diversified? I touched on diversification using bonds in my last post, and will discuss diversification more broadly now.

So, what is diversification?

Simply put, diversification is not allowing for concentrated positions in a portfolio. For example, if you have a portfolio of a single stock, this portfolio is not diversified. But, as more stock is added from different companies in different sectors, investors can often reduce portfolio risk. However, market risk remains, as shown below.

Increasing the number of stocks reduces risk, as measured by the standard deviations of periodic returns.
Increasing the number of stocks reduces risk, as measured by the standard deviations of periodic returns.

Going beyond market risk for wider diversification and reduced volatility

A simple approach to managing portfolio risk is through mutual funds or exchange traded funds. Both investment vehicles hold a basket of many securities, eliminating the need to hold individual stocks to properly diversify. Here at ETFMathGuy, we are advocates of ETFs (exchanged traded funds), because ETFs have better tax efficiency, (usually) lower expense ratios, and often trade commission-free.

Now, most individuals also invest outside the stock market. So, they seek diversification by investing in other asset classes too. For instance, bonds tend to “zig” when stocks “zag”. To see an example of this approach, consider the conservative Fidelity optimal portfolio by ETFMathGuy published for March 2019, and shown below.

Taxable portfolio using Fidelity commission-free ETFs reduces volatility

Assuming an investor buys-and-holds this portfolio from March 4, 2019 through May 21, 2019, the growth of $100 appears below. Notice that the large drop at the end of this time period. This volatility, shown in blue as the S&P 500 ETF (ticker: IVV), is largely unnoticeable in the ETFMathGuy optimal portfolio, shown in green.

Comparing volatility of the conservative ETFMathGuy optimal Fidelity portfolio to the S&P 500 ETF
Comparing volatility of the conservative ETFMathGuy optimal Fidelity portfolio to the S&P 500 ETF

Digging into the statistics reveals compelling information about the volatility. The annualized volatility over this period of the ETFMathGuy portfolio is 4.0% versus 11.0% for the S&P 500 ETF. Clearly, diversification across asset classes (like stocks and bonds) can be a very effective way to manage volatility.


ETFMathGuy is a subscription-based education service for investors interested in using commission-free ETFs in efficient portfolios.