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December 17, 2010
“Assuming an 8% return…” Really?
By Cindy Ivanac-Lillig
I recently came across a number of classroom tools and curricula that are designed to teach the power of compound interest with statements like, “Assuming the annual return on your investment is 8%, calculate your earnings.....” Being a finance major many moons ago, I am pretty familiar with investment rates of about 8%. This would have been a pretty run-of-the-mill assumption according to most of my academic texts. If any of you are involved in personal finance education or have just worked on your company's 401K calculator, this rate of return may seem familiar as well.
But, is 8% realistic as a long-term rate of return on the stock market? Don’t we teach our students in economics that our long-term growth rate is somewhere in the 2-2.5% range? Now, granted, we are living in a globalized financial world, but this assumption that is codified in our lesson plans as somewhat modest may need some re-examining.
The idea that investors should expect 8% and students should on some level compare bank account savings rates with 8% seems misplaced. It is true that over the last century, 10 and 20-year investment returns bounced around somewhere between 5 and 15% -- but let’s remember that this is at least 10 years worth of uninterrupted investment. And, if you were the unlucky person who retired at the end of 2008, you saw 25% of your investment vanish in weeks.
I am not advocating we stop teaching about the stock market, on the contrary I am advocating that we teach about effective decision making and the fundamentals of economic growth. The stock market is not magic. It ultimately drives investment in the production of goods and services. It cannot grow sustainably without regard to the health and pace of the global economy. Long term growth of the stock market is tied to the long-term growth of the world economy. Students can and should be taught to think critically about this. And folks that put out tools to teach compound interest should be careful to not treat stock market and savings accounts similarly especially in rather short time horizons.
They say that the stock market is forward looking. I think the trick may be to help students become more forward looking….
What do you think?
Posted by Cindy at December 17, 2010 10:44 PM
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Throughout my studies I've seen 8-10 percent and always thought sarcastically: "yea historically" I could not agree more that the 10% stock market return hypo can mislead early students of economics or business. Now if only we can start teaching students the concept of compound interest and the like at an earlier academic level.
Posted by: JD/MBA from DC at December 18, 2010 1:31 AM
If we really want to assume an 8% return, we should at least be honest enough to note that it's a nominal one.
If you look at Malkiel, large returns tend to come when present (not projected) earnings are running at a stock market P/E below 12--15 at the highest.
With EBITDA (i.e., what we would be making if we didn't run the company the way we do), "forward earnings" (what we think we're going to make), and a current P/E closer to 17-20, anyone who wants to bet on an "equity premium" is welcome to do so--but they shouldn't bet their retirement income on it.
Capital is, by definition, money you can afford to lose. The U.S. stock market ceased to be a "capital market" when people were allowed to bet their retirement savings in it, and the shifts that have made the "8% return" about as realistic as being able to buy Treasuries with that type of coupon at Par haven't been reflected in textbooks.
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@ Ken Houghton
I think the key factor to look at for stock market returns is the ratio of capital to entrepreneurship. Entrepreneurial activity is the pipeline through which capital needs to flow. If a society is not generating entrepreneurs fast enough, or funneling capital to them efficiently enough, then the system will back up and P/Es will begin to rise (though capital flows have many determinants and are certainly much more volatile than the entrepreneurship end of the equation).
The policy insight then is that we need to incentivize a higher proportion of small-scale high-risk (a la angel/venture capital) capital investment. This is after all the breeding ground of entrepreneurs. The more players we let on the field, the broader our entrepreneurial base, and the greater the scale of investment opportunity.
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