Inflationary Questions

Inflated Supercore
“Structural Breaks”
Ineffective Tools
West Coast Fishing, Austin, and Houston

Last week I compared our jobs data, which is sometimes questionable, to World War II weather forecasts. Those were also questionable but necessary anyway. The generals needed them “for planning purposes.”

This analogy has a flaw, though. A forecast for future weather isn’t the same as data on past weather. The data—wind speed, barometric pressure, and so on—is the input that goes into the forecast. Assuming the instruments work, the data is what it is. It may or may not lead to an accurate forecast.

With economic data, the challenge is that our instruments are more error prone. The monthly jobs reports rely on employers responding to surveys correctly and quickly. The fact this doesn’t always happen causes revisions that call the whole process into question. That’s not because anyone is hiding anything. The process is understood and transparent. Just by their nature, surveys are error prone and even more so of late.

Notice the revisions below cycle through periods of mostly higher, then mostly lower. This is because the BLS’s methodology is backwards looking and trend following, which causes large revisions when the trend changes. The data responds more slowly at turns in the economic and employment cycle. By the way, notice that most of the revisions are undercounts. That is because the economy was growing most of the time since 2008.

undercounts