Market Efficiency
The theory of Market Efficiency is that all available information that might affect stock prices, whether company-specific, macroeconomic or other, are incorporated into stock prices immediately and accurately. Behavioral Finance is a conflicting theory that asserts that market prices are driven in great respect by emotional factors (such as FOMO), biases, and cognitive errors. This conflict has been contested for many decades. Both theories are confirmed by the award of Nobel Prizes to their adherents.
What do we make of market dynamics today (April 2022)? I am an advocate that the market is mostly efficient. My evidence is that few professional investment managers beat the market in any year, much less over a period of years. Nevertheless there are instances of clear mispricing that can be detected ex ante. In 2021, profitless growth was priced on the basis of historically high P/S ratios ranging up to 100x. Many of us argued at the time that these were unsustainable over even the medium term. This is the best evidence supporting Behavioral Finance. These valuations were clearly affected, in very large part by the ZIRP interest rate policy of the Federal Reserve, and stimulus of all the major governments in the world. This resulted in a historically low discount rate. Since these companies were not projecting earnings for many years, the discount rate applied to distant cash flows and earnings was a critical factor in valuation. However even at the time, it was clear that these factors were coming to an end. Nevertheless, high valuation persisted for a long time.
Another factor in stock prices over the last two years has been the impact of the Covid Pandemic. Since its onset in March 2020, consumer behavior shifted dramatically to WFH, Play at Home and Shop at Home as consumers endured government mandated lockdowns in many jurisdictions. The Covid Pandemic is not over, but clearly in the US, it is on the wane and return to normal is taking hold not just in work, but also in Entertainment (full sports stadia) and Travel. Until recently, little attention was paid to the Pandemic Darlings; those companies that benefited from Covid. The poster children for this phenomenon are Peloton and Zoom Video. But there were many others including Apple, Microsoft, Facebook, NFLX, Amazon, and Roku. .
Here is where market efficiency should have kicked in. By January 2022, it was clear that the largest pandemic impacts were dissipating in the US. Mask mandates were being phased out: vaccine cards were no longer being required in indoor places and testing sites were empty. Also, by this time, the Federal Reserve's intention to being to increase interest rates to more "normal" levels was well understood although the path was uncertain. The market should have been able to incorporate the loss of the pandemic benefit into stock prices. This is not complex. Take earnings from 2019, pre-pandemic, add a little for permanent growth, and you have a reasonable forecast for post pandemic. Yet in the past two weeks, the market has been surprised by the loss of pandemic benefit in two high profile stocks: NFLX and AMZN. Yesterday, AMZN reported earnings, and the stock price is -9% today despite continued high growth in its AWS business. NFLX reported last week, and was down over 30%. Yes, there are company-specific issues and macroeconomic issues (supply chain, energy and Ukraine War) that affect many stocks but clearly the market did not correctly anticipate the Pandemic benefit.
In the age of the Internet, Market Efficiency should apply regardless of the size of the company involved. However there is an argument that small companies with limited analyst following are more prone to inefficient prices due to lack of information and the inability of arbitrage to correct mispricing. I mention NFLX and AMZN because they are widely followed by Wall Street Analysts. There is no argument that the stock dynamics are a function of lack of information or arbitrage. I acknowledge that we can see larger evidence of inefficiency in smaller stocks in which there is less information available (fewer analysts) and arbitrage is more difficult. The poster child for this argument might be TDOC which reported its earnings this week and sank more than 30% from an already near 52-week low. Similarly, after reporting declining active users, HOOD suffered a decline of 10% as its users begin to leave their comfortable couch and return to work.
We are living through a market period that is not only volatile but also topsy-turvy. Profitless Growth is no longer being rewarded with huge valuations. (Plus for Efficiency). However, yesterday's price action reminds us that the market has still not adjusted for the pandemic benefit received by many companies. This is negative for the market efficiency advocates.