My recent work on macroeconomics has stressed long-term issues, including the determinants of long-run economic growth. From the standpoint of fighti… - Robert Barro

I find it amazing now that my first economics class, taught by Alan Sweezy, used John Maynard Keynes’s General Theory of Income and Employment as the textbook. Although this book is one of the most influential works of the twentieth century, it makes a really lousy textbook. Moreover, since I now regard Keynes’s analysis as seriously flawed, it is surprising that I enjoyed the course so much. As a student, I appreciated the simple way that the Keynesian model explained the workings and failings of the overall economy. Especially appealing were the clever policy remedies, such as increased government spending and tax cuts, that Keynes recommended to combat unemployment. Too bad that I discovered later that the model was theoretically and empirically deficient!

The role of expectations is not limited to monetary policy but is crucial in many areas of economics, as Bob showed in his later research on investment, unemployment, taxation, public debt management, and asset pricing. In all of these situations, the appropriate evaluation of policy takes account of the way that expectations would be rationally formed.

The last chapter modeled technological progress as an increase in the number of types of products, N. In this chapter, we allow for improvements in the quality or productivity of each type. This approach has come to be known as the Schumpeterian approach to endogenous growth. We can think of increases in N as basic innovations that amount to dramatically new kinds of goods or methods of production. In contrast, increases in the quality of the existing products involve a continuing series of improvements and refinements of goods and techniques.