The tech sector's role in driving US growth
The tech sector is driving the US economy, accounting for the bulk of recent growth. Outside of tech, the economy is not as good, while the strength in tech investment is exaggerated by the rapid depreciation of software and computers. Demand for tech is very narrowly based, and the productivity payoff is highly uneven. With the tech sector driving growth, the speed limit for the US economy is about 2½%, higher than the FOMC estimate of potential growth of about 2%. Potential growth is a key influence on the neutral policy rate, so this supports the view that the neutral rate is likely higher than the FOMC estimate of about 3%.
1. The US is the best performing economy in the post-COVID period.
The pandemic has had lasting effects on several advanced economies, with GDP well below pre-COVID levels in the EA, JPN, the UK, and NZ, something you might ordinarily expect in the wake of a financial crisis. In contrast, the US, CAN and AUS have tracked closely to their simple pre-COVID trends, with the US narrowly outperforming.
2. Three-quarters of recent US economic growth has been driven by the tech sector.
The role of tech in driving the US economy can be approximated by estimating the contribution to growth from the tech capital stock and technological progress, where tech covers IT equipment, software and research and development and technological progress is proxied by multifactor productivity.
On this basis, the tech sector has accounted for 75% of recent US economic growth. This is basically the same aggregate contribution that was made during the dot-com bubble of the late 1990s. Overall economic growth was much stronger during the 1990s because the labour market was also booming.
3. Outside the tech sector, the news is not as good.
Outside the tech sector, the economy is not doing that well. Annual growth in the non-tech capital stock is weak at 1% and has recently slowed. Growth at this rate is close to the low points reached after the recessions of the 1980s, 1990s and 2000s.
4. The tech sector’s strength is exaggerated.
While the tech sector is driving US economic growth, the strength of investment is flattered by high rates of depreciation, where rising investment has to account for the rapid wear and tear of existing tech assets. As a result, annual growth in the tech capital stock is also historically weak, although, unlike the non-tech sector, growth has accelerated recently from 6 to 8%.
5. The demand for tech in the US is narrowly based and is dominated by the IT and finance sectors.
The demand for software, which drives tech investment, is narrowly based on the US. Half of all spending on software is accounted for by the IT and finance sectors, with professional services bringing the total share to almost two-thirds.
6. Tech investment has a very uneven payoff on productivity.
Among the three sectors accounting for the bulk of tech investment, the positive payoff in terms of productivity is very clear for the IT and professional services sectors. However, the finance sector – which is dominated by banks and insurers – has seen productivity stagnate since the global financial crisis.
7. The speed limit for US growth looks higher than thought by the Fed.
With the tech sector driving growth, we estimated that the speed limit for the US economy is 2½%, based on a production function approach. This growth rate for potential output is higher than the roughly 2% median of FOMC estimates and has been higher than the Fed’s calculation for about the past ten years.
8. Higher potential growth supports the view that the neutral funds rate is higher than the FOMC estimate of about 3%.
Potential growth is an important influence on the neutral policy rate. With the estimated 2½% speed limit for US growth exceeding the FOMC’s 2% calculation, this points to the neutral funds rate being above the median FOMC estimate of about 3%, where Fed staff models put it at around 3½% and average market pricing is about 4%.
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