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After examining several indicators, which, however, are not unequivocal for their interpretation despite saying "no doubt", Noah Smith comes down on the side of improved sentiment as the cause of the current "boom".
On that we agree. There's a boom in sentiment.
The problem is, too many people are importing that improved sentiment into their reading of the data, and into their choice of the data.
For example, Smith focuses on job openings to unemployed, which is a tiny measure (6.66 million in June) of what's really going on in the labor market. But the broadest measures of unemployment still show 15.9 million unemployed, underemployed, and no longer counted in the labor force. There is still huge slack in the labor market, which is one reason why wages for the vast majority of workers are not rising like they would in a real economic boom (2.7% y/y in July vs. in the 4s in 2006/7).
Similarly Smith discusses the percent of population employed aged 25-54, but clearly misses that it's most definitely not "back to 2006 levels" as he claims (H1 2018 is at 79.2%, still below the 2006 average of 79.8% and also below the average of either half of 2006). The broadest measure of the percent employed, on the other hand, still shows a huge gap between now and the pre-Great Recession average when over 6 million more were employed than are at present (60.5% now vs. 62.9% then, on average).
The case is similar with domestic investment.
Smith chooses to highlight "Shares of gross domestic product: Gross private domestic investment: Fixed investment: Nonresidential (A008RE1Q156NBEA)" to show that "investment as a percentage of the economy is at about the level of the mid-2000s boom". But the current level in H1 2018 at 13.7% is also identical to H2 2014. Was that indicative of a boom? Did we blink and miss it? How about in H1 2008 when it was again at 13.7%? Was that indicative of a boom? If so, why did the economy then promptly crash in H2 2008?
A broader measure of domestic investment, however, "Shares of gross domestic product: Gross private domestic investment (A006RE1Q156NBEA)", shows us well off the 2006 peak and even the more recent 2015 level. Whatever we call what we have right now, the current 17.7% is still far below the 19.8% level of H1 2006, which itself failed to equal the boom level of the year 2000 (19.9%).
With all that cash unleashed by the tax reforms and sloshing around in the economy, one would think things would look a lot better than this, which simply shows that most of that money indeed went elsewhere.
GDP has been temporarily goosed by the tax reforms in concert with a fresh gusher of federal deficit spending. But those are one-offs. They will not, and cannot, be repeated over and over again in short succession.
We know what comes next.
