Changes to the nature of workforces in the developed world have seen the proportion of Gross Domestic Product (GDP) accounted for by wages fall for several decades, boosting investment returns. However, these trends could be set to reverse, with negative consequences for investors in the years to come.
The past 50 years have been a golden age for equity investors, and bonds have also provided attractive returns
One of the reasons for the strong investment returns over recent decades has been a fall in the labour share of GDP
The labour share of GDP now looks to be rising, with likely negative consequences for investment returns over the years to come
In the expected lower-return environment, we believe shorter-maturity corporate bonds, dividend-yielding equities, and stocks exposed to disruptive technology are best placed to prosper
Investment returns are not just driven by relatively short-term considerations, such as company fundamentals, investor sentiment or geopolitical developments: secular macroeconomic trends also play an important role over the long term.
One of these is the development of the labour share of GDP – the portion of national income allocated to wages. It is related to the capital or profit share (the proportion of income going to capital owners) as capital share and labour share of GDP are often assumed to add up to 100%. It is worth examining how changes in the global workforce and other macroeconomic factors could impact investors over the years to come.
A falling labour share has boosted stock-market returns for several decades…
The labour share has fallen in the developed world in recent decades. Immediately after World War II, wages accounted for almost two-thirds of GDP in the US, and as recently as 1980, the figure was over 70% in Japan. But the figures for most developed countries today stand at just over 55%.
These differences might not sound huge, but they have big implications for investors as the higher share of GDP going to owners of capital rather than earnings has significantly boosted asset returns. For example, the increase of capital share in the US – from about 36% of GDP in 1969 to 44% today – has added about 40 basis points (bps) to average annualised US equity returns. And this doesn’t even take into account the higher dividends made possible by higher earnings or the compounding effect of increased returns.
So why have wages been falling over this period?
One hypothesis suggests greater international trade and increased globalisation has reduced the ability of workers in each country to negotiate higher wages. Another suggests technological innovation has held back wage growth: there’s strong evidence that replacing certain jobs with computers has reduced demand for low-skilled workers and limited wage costs.
There’s also a hypothesis that the relative supply of workers and capital influences the labour share of GDP. Dependency ratios declined dramatically in the second half of the 20th century as people started having fewer children, and the number of children relative to working-age people fell. Similarly, the availability of workers in the developed world has increased in recent decades as labour participation rates have risen, with more women in the workforce the main driver of this trend.
…but the tide looks to be turning
Now, things look to be changing. In the developed world, the number of pensioners is rising faster than the workforce, while labour participation rates are starting to fall.
Dependency ratios and labour force participation rates
Source: World Bank and OECD, April 2019
Meanwhile, as awareness of income inequality has increased, populist politicians are proposing more aggressive taxes to reallocate wealth, and workers in economies with historically low unemployment are likely to demand a bigger share of the pie.
All this may sound academic, but it has some important implications for potential future investment returns.
An end to the golden age for equity investors
The past few decades have been a golden age for equity holders. Growth has been strong overall, shares are now trading at price-to-earnings (PE) multiples 40 to 50% higher than in the early 1970s (adding 70–80bps to average annualised total returns), corporate tax rates are low and the capital share of GDP is near its historical high.
But we’re unlikely to see such high economic growth in the coming decades. It’s hard to envisage valuations continuing to rise in a slower-growth environment, further reductions in corporate tax rates are unlikely to be viable politically, and the labour share of GDP may be bottoming out or even rising. This implies that equity returns will face headwinds, or at the very least weaker tailwinds than in the past.
Over the past 50 years, an investment in the S&P 500 would have earned almost 10% a year in nominal terms, and more than 5.5% after inflation. If we assume that future economic growth is likely to be closer to 2% than the 3% average we’ve seen over the past 50 years, that valuation multiples don’t change much, and that the labour share of GDP remains constant, then we are likely to lose 2 percentage points or more from our real returns in the coming years.
What’s more, if inflation remains low, even nominal returns are likely to be considerably lower than in the recent past. A 3% real return and 5% nominal return for equities suggests prices will more or less increase with inflation, while real returns will largely be made up of dividend payments. Should the labour share of the economy increase further and valuation multiples return to historic norms, then equity return expectations would be even lower.
What about bonds? Today, yields are far below what they were 50 years ago. Back then, 10-year US Treasury and German government bonds were yielding around 7%, but those yields have now respectively fallen to below 2% and below 0%. So while equities look like they are positioned to return less than in the past, we know bonds will. With inflation-linked bonds in the US yielding 0.5%, and almost -1%? in Germany, just maintaining your purchasing power will be a challenge for bondholders over the next decade, let alone earning a positive return after tax and inflation.
What should investors do?
Investors should expect lower equity returns than they have become used to, while "risk-free" assets like government bonds are unlikely to return enough to cover inflation. At the same time, intermediate assets like corporate bonds could yield as much as or more than equities, and with substantially less volatility, in the coming years.
The critical challenge will be to find assets that maintain their principal and generate some modest returns. In our view, shorter-maturity corporate bonds, dividend-yielding equities and stocks exposed to disruptive technology are most likely to generate modest positive returns.
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Karl Happe is Chief Investment Officer (CIO) Insurance Related Strategies with Allianz Global Investors, which he joined in 2013. He leads a team that manages equity and fixed-income portfolios for insurers. Karl was previously the head of the global fixed-income strategy team, responsible for managing global fixed-income portfolios for Allianz. Before joining Allianz in 2004, he worked at McKinsey & Co. in Munich; at BankBoston as the head of non-USD fixed income derivatives trading; and at Morgan Stanley in private equity and fixed income derivatives structuring and trading in New York, Frankfurt and London. Karl has a B.S.E in civil engineering and operations research, summa cum laude, from Princeton University and studied at the University of Stuttgart on a Fulbright scholarship. He also has an M.B.A. with distinction from INSEAD.
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