Cleveland Fed: "Textbook macroeconomic theory predicts a positive relationship between productivity and real interest rates; last year, our researcher found a negative correlation"

From the Federal Reserve Bank of Cleveland's Twitter feed:

Textbook macroeconomic theory predicts a positive relationship between productivity and real interest rates; last year, our researcher found a negative correlation https://t.co/xEgeN5E7nc pic.twitter.com/opmmKLIh76

— ClevelandFedResearch (@ClevFedResearch) October 26, 2018

The paper is titled: "Productivity Growth and Real Interest Rates in the Long Run"