Forum Mailbag: Madness Of Crowds, Stock Market Randomness, Recency Bias And More!

December 21st, 2018
19

There is so much great information on personal finance forums. I participate on several message boards, including the Bogleheads and White Coat Investor forums. Here are some of the discussions happening around the internet.

1. Bogleheads: The Madness and Wisdom of Crowds

Question: Kayanco noticed that the titles of two books on investing he recently encountered seemed to have opposite opinions on the behavior of the stock market:

Extraordinary Popular Delusions and the Madness of Crowds (by Charles MacKay), and

The Wisdom of Crowds (by James Surowiecki).

He was wondering whether these two book titles could be reconciled (i.e. can the stock market “crowd” both be mad and wise).

WSP’s Take: I have not read either of these books, but I would argue that the stock market can act both rationally and mad (a rational madman?).

The concept that the stock market is wise should be intuitive to most investors who choose to invest in index funds. The stock market as a whole prices stocks in a way where it cannot easily be consistently beaten. Academics have generally assumed an efficient market where market participants price in all publicly available information. If every stock is priced correctly, then it is no surprise that most actively-managed mutual funds fail to beat the market.

On the other hand, markets can also be mad. Bubbles are a classic example of this. A year ago, everyone was talking about Bitcoin and its meteoric rise. Some may argue that this is an example of markets acting irrationally, and that “of course” Bitcoin was overvalued. But if someone bought Bitcoin as it crossed $10,000 in December 2017, they were not necessarily making a losing investment. Bitcoin could have just as easily risen to $100,000 as it could have fallen to $4,000, so $10,000 was likely a fair value for Bitcoin at that time. Bubbles and other investment manias are not counterexamples to the efficient market hypothesis.

2. Bogleheads: Total Stock Market Randomness

Question: Masonstone asks why the total stock market seems to move so erratically.

WSP’s Take: If you believe in the efficient market hypothesis where the price of a stock is based on the accurate evaluation of all publicly available information, then it makes sense that the movements of the stock market are random. New information becomes available in a random fashion, so the stock market should move randomly as well.

3. Reddit: Changing Recommendations on the Pay Off Debt vs. Invest Question

Question: The decision to pay off low-interest debt or invest in assets with higher expected returns (i.e. stocks) is one of the most common questions in personal finance. ImOscarDotComm makes the observation that the reader recommendations to this question have changed as the stock market has begun to fall (i.e. more people are recommending paying off debt).

WSP’s Take: This is not surprising and is not limited to just the invest vs. pay off debt debate. For example, I’ve noticed an uptick in articles questioning index fund investing as the markets have become more turbulent. I’ve argued in a previous post that part of the rapid growth in index fund investing in recent years is because the stock market was rising. I believe that the flow of money into index funds would slow in a bear market as investors search for a way to stop losing money. The desire to beat the market is stronger in down markets than in rising markets, and actively-managed mutual funds offer the promise of returns that can outperform the market (but rarely deliver).

4. Reader Question: Big Discrepancy Between Mutual Fund NAV Change and Tracking Index Move

Question: A concerned reader e-mailed me the following question.

He owned PLFIX (an S&P 500 index fund) in his 403(b). On 12/19/18, it decreased by 6.48%, while the S&P 500 decreased by 1.54%.

He was wondering whether it is possible for an index fund to decrease/increase by more than the index that it tracks?

WSP’s Take: Great question. I would certainly be worried if I saw this discrepancy in my investment account. My guess is that the mutual fund paid out their annual capital gains and distribution on 12/19/18.

Looking at the historical distributions on the right side of Fidelity’s page describing the distributions for this mutual fund, you see that they pay out a portion of their assets in the form of dividends and capital gains near the end of each year. It varies from year to year, but it’s completely plausible for the 2018 amount to be the 5% discrepancy between the change in NAV value and the performance of the S&P 500 on this day. The NAV goes down by the amount of the capital gains and dividend, but that money is being reinvested back into the fund (or distributed out as cash).

Wall Street Shares: 5 Articles To Read This Week

  1. The Boss MD: How To Maximize A Physician’s Salary — Excellent tips from internist Dr. Robert Glass.
  2. White Coat Investor: Why You Should Not Give Up On Public Service Loan Forgiveness — PSLF is the centerpiece of many physician’s loan repayment plans, but it has gotten some recent bad press.
  3. The Physician Philosopher: How Should I Save For My Kid’s College? Plus a 529 Plan Hack — TPP explains why you should not hesitate to contribute to a 529 plan even if you think your child might get a scholarship.
  4. Passive Income MD: Things to Know About Investing in Turnkey Real Estate — an FAQ on investing in this form of property.
  5. Millionaire Doc: Success is a Process, Not an Event — It’s about the journey, not the destination.

What do you think? Do you agree or disagree with any of my responses? What’s your take on the topics in this week’s forum mailbag?

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