Good Economics for Hard Times: Better Answers to Our Biggest Problems

by Abhijit V. Banerjee

Making somewhat heroic assumptions, it is possible to guesstimate the contribution of these two factors. Robert Gordon reckons that rising education explains about 14 percent of the increase in labor productivity over the period, and the capital investment that gave workers more and better machines to work with explains a further 19 percent of the increase. The rest of the observed productivity improvement cannot be explained by changes in things economists can measure. To make ourselves feel better, economists have given it its own name: total factor productivity, or TFP. (The famous growth economist Robert Solow defined TFP to be “a measure of our ignorance.”) Growth in total factor productivity is what is left after we have accounted for everything we can measure.