Abstract The rise of the super-rich has attracted much political and academic attention in recent years. However, there have been few attempts to explain the cross-national along with the temporal variation in the rise of top incomes. Drawing on the World Wealth and Income Database, we study the income share of the top 1% in current postindustrial democracies from 1960 to 2012. We find that extreme income concentration at the top is a predominantly political phenomenon, not the result of increasing marginal productivity of top managers in markets of increasing size. Top income shares are largely unrelated to economic growth, increased knowledge-intensive production, export competitiveness, financialization and wealth accumulation, though they are related to stock market capitalization. Instead, they are closely associated with political and policy changes such as union density and centralization, secular-right governments, top marginal tax rates and investment in public tertiary education.

Based on worldly experience, most people would agree that firms are hierarchically organized, and that pay tends to increase as one moves up the hierarchy. But how this hierarchical structure affects income distribution has not been widely studied. To remedy this situation, this paper presents a new model of income distribution that explores the effects of social hierarchy. This 'hierarchy model' takes the limited available evidence on the structure of firm hierarchies, and generalizes it to create a large-scale simulation of the hierarchical structure of the United States economy. Using this model, I conduct the first quantitative investigation of hierarchy's effect on income distribution. I find that hierarchy plays a dominant role in shaping the tail of US income distribution. The model suggests that hierarchy is responsible for generating the power-law scaling of top incomes. Moreover, I find that hierarchy can be used to unify the study of personal and functional income distribution, as well as to understand historical trends in income inequality.

What is the unit of analysis in economics? The prevailing orthodoxy in mainstream economic theory is that the individual is the ‘ultimate’ unit of analysis. The implicit goal of mainstream economics is to root macro-level social structure in the micro-level actions of individuals. But there is a simple problem with this approach: our knowledge of human behavior is hopelessly inadequate for the task at hand. Faced with real-world complexities, economists are forced to make bold (and seldom tested) assumptions about human behavior in order to make models tractable. The result is theory that has little to do with the real world. This dissertation investigates an alternative approach to economics that I call ‘economics from the top down’. This approach begins with the following question: what happens when we take the analytical focus off of individuals and put it into social hierarchy? The effect of this analytical shift is that we are forced to deal with the realities of concentrated power. The focus on hierarchy leads to some surprising discoveries. First, I find evidence that hierarchical organization has a biophysical basis. I show that institution size (firms and governments) is strongly correlated with rates of energy consumption, and that the growth of institutions can be interpreted as the growth of social hierarchy. Second, I find that hierarchy plays an important role in shaping income and income distribution. I find that income scales strongly with hierarchical power (defined as the number of subordinates under one’s control), and that hierarchical power affects income more strongly than any other factor measured. Lastly, using an empirically informed model of the hierarchical structure of US firms, I find that hierarchy plays a dominant role in shaping the income distribution tail. These results hint that hierarchy can be used to unify the study of economic growth (understood in biophysical terms) and income distribution. I conclude by making the first prediction of how the concentration of hierarchical power should relate to the growth of energy consumption. This prediction sheds new light on the origin of inequality. While this ‘top down’ approach to economics is in its infancy, the results are encouraging. Focusing on hierarchy gives fresh insight into many of the important questions facing society — insight that cannot be obtained by focusing on individuals.