The economists looked at such indicators as the yield curve and the stock market to evaluate whether the expansion may be nearing an end. The yield curve in particular, Greenwood says, has been able to predict each of the nine recessions that have happened.

The yield curve has been compressing recently as short-term interest rates have risen faster than long-term rates. C&W economist and lead forecaster Rebecca Rockey believes it has the potential to compress further or to sit comfortably as-is for some time. Still, it is in positive territory. The Fed did not raise interest rates during its policy meeting this week, keeping the federal funds rate steady at its target 1.5% to 1.75%. Predictions about interest rates put them at 3.4% in 2020. The ten-year Treasury just broke through the psychological benchmark of 3% and the one-year rate is about 70 basis points below. The ten-year Treasury rate is expected to be at 3.6% in 2020.

“The actual pace of rate increases has been much slower than anybody anticipated,” Greenwood says. Also, she adds, there are tailwinds from the fiscal stimulus that bode well for the economy. As for the recent stock price volatility, that probably tells us more about investors' reactions to earnings reports and their appetite for unpredictable policies than anything about the business cycle, Greenwood says.

She also points to the Fed's statement this week, which signalled a greater confidence in their inflation forecast, compared to earlier statements. “They're basically saying that as long it's about 2% they want to keep an even keel on the ship.”