Stocks and bonds carry many benefits when held over the long term. In this post, I highlight a few aspects that are important to individual investors.
Two of the largest stock and bond ETFs analyzed each month by ETFMathGuy follow the tickers symbols IVV and AGG. IVV tracks the S&P 500 index, which consists of large U.S. companies. The top 10 holdings of IVV appear below.
The ticker symbol AGG tracks the Bloomberg Barclays U.S. Aggregate Bond Index. As we discussed in our previous post on the “Fundamentals of Fixed Income ETFs“, quality and maturity are two important components. The quality component of this ETF is largely influenced by its 40% of holdings of U.S. government bonds, and over 20% of mortgage backed securities. Top sector holdings appear below.
The bonds in AGG have an average maturity of about 8 years. Consequently, interest rate changes generally affect its price more than similar bond ETFs with shorter maturities.
Long term returns of stocks and bonds
The fundamental information about stock and bond ETFs is important, but doesn’t really address long-term investment performance. For that, consider the following chart that shows the total return of $100,000 invested in either the stock (green) or bond (blue) ETFs mentioned previously.
As this chart shows, much better returns are possible with stocks, provided investors are willing to accept the higher volatility. Annual growth rate of the stock ETF (IVV) is more than double (8.7% versus 4.0%) than the bond ETF (AGG). But, the volatility of the stock ETF is nearly four times (4X) larger than the volatility of the bond ETF.
Asset allocation basics
So, what is the correct allocation between stocks and bonds using ETFs? Generally speaking, investors seeking less risk will seek more bonds and less stock exposure. One simple rule of thumb is the “120-age” formula for stocks. So, a 30-year old investor would be 90% in stocks and 10% in bonds. Similarly, an 80-year old investor would be 40% stocks and 60% bonds. A more conservative approach is the “100-age” formula for stocks. In any case, investment risk typically increases with a higher allocation to stocks, and decreases with a higher allocation to bonds.
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