Investors who trade based on GDP data or unemployment reports are often reacting to the past while the market is already pricing the future.
The Forward-Looking Machine
In March 2020, as the global pandemic took hold, Canada lost one million jobs in a single month. On the day Statistics Canada released this staggering figure, the S&P/TSX Composite Index did something counterintuitive: it closed up 1.73%. This phenomenon frequently baffles casual observers, but it highlights a fundamental truth of finance. The stock market is not a reflection of the current economy; it is a forward-looking pricing machine. It incorporates expectations about the future into prices today, whereas economic news is almost entirely backward-looking.
Market efficiency dictates that stock prices already contain information about expected future profits and the inherent risks of those profits. If an unemployment report matches what analysts predicted, the market has no reason to move. Prices only shift when news is unexpected. Consequently, whether news is 'good' or 'bad' in an absolute sense is irrelevant to an investor. What matters is whether the news is better or worse than what the market had already priced in. This is why historically terrible economic data can coexist with historically high daily market returns.
The Lag of Economic Reality
The global financial crisis of 2008 provides a masterclass in the lagging nature of economic data. The U.S. stock market began its decline in October 2007, two months before the recession officially started. However, the National Bureau of Economic Research (NBER) didn't actually announce the start date of that recession until December 2008—a full year after the fact. By the time the NBER declared the recession over in September 2010, the recovery had been underway for fifteen months.
During the depths of 2009, the data was relentlessly gloomy. Unemployment peaked at 10% in October, and GDP hit its low point in the second quarter. To an investor watching the news, it seemed like a disastrous time to own equities. Yet, the market had already bottomed out in February 2009. From March through December of that year, the U.S. stock market surged 56% despite deteriorating economic reports. The market didn't care that the data was bad; it cared that the reality was slightly less catastrophic than the apocalypse it had previously feared.
The Paradox of Growth
If the short-term relationship between the economy and the market is loose, one might assume the long-term relationship is ironclad. It seems logical that a rapidly growing economy like China would naturally deliver higher returns than a mature, slower-growth economy like Canada. However, intuition is a poor guide in investing. In his 2012 study, Jay Ritter examined the relationship between GDP growth and stock returns across 19 developed countries over a century. He found a negative correlation of -0.39. A similar study of emerging markets showed a negative correlation of -0.41.
This suggests that countries with the strongest economic growth have historically produced lower stock market returns. One explanation is that investors often overpay for expected growth. In an efficient market, if everyone knows an economy is going to grow at 10%, that growth is already baked into the high price of the stocks. If the economy then grows at exactly 10%, the investor gains nothing extra. If it grows at 'only' 8%, the investor loses money despite the impressive expansion. This helps explain why Chinese stocks have often disappointed investors despite the country's massive economic transformation.
The Problem of Slippage
Beyond market pricing, there is a structural reason why economic growth fails to reach shareholders: a concept known as 'slippage.' As Robert Arnott and William Bernstein detailed in their research, there is a persistent shortfall between aggregate economic growth and growth in earnings per share (EPS). While aggregate corporate earnings generally track GDP, an individual investor only benefits from growth in earnings per share. In a rapidly expanding economy, much of the growth comes from new companies forming or existing companies issuing new shares to raise capital.
When a new company lists on an exchange, it contributes to the GDP and the total market capitalization of the country, but it does not increase the value of an existing investor's portfolio. To participate in that new growth, an investor must reallocate existing capital, which is a zero-sum move for their net worth. This dilution is particularly visible in war-torn countries that underwent rapid reconstruction. While their GDPs often caught up to or surpassed their peers, their stock market returns trailed significantly because the 'equity recapitalization' required to rebuild the economy diluted the stakes of original shareholders.
Ignoring the Noise
The conclusion for the disciplined investor is clear: economic data is a distraction. In the short term, price changes are driven by unpredictable shifts in expectations. In the long term, high-growth economies often suffer from overvaluation and share dilution. Attempting to time the market based on the latest GDP print or yield curve inversion is a strategy that ignores the fact that the market has likely already moved on to the next set of concerns.
While following the economy is intellectually stimulating and helps one understand the world, it should not inform a portfolio strategy. If the constant drumbeat of economic news makes it difficult to stick to a long-term plan, the most rational move is to ignore the headlines entirely. Successful investing is not about predicting the economy; it is about surviving the gap between economic reality and market expectations.