Beginning in 1990, several forces converged to shape the global economy. Globalization, demographics, technology, deflation, debt, and interest rates have all played a role. Now, according to a recent book, at least two of those forces are reversing. In The Great Demographic Reversal, authors Charles Goodhart and Manoj Pradhan describe these forces and their influence on the last thirty years of economic activity. With this convergence, the world experienced an extended deflationary period, which per the authors, was driven in part by a labor supply shock. The book said the following: