1/2 When the rich get richer - by Angus Deaton (中間層の減少と民主主義の危機ー書評)

President Obama labeled income inequality the defining challenge of our time. But why exactly? And why our time especially? In part because we now know how just how much goes to the very top of the income distribution, and beyond that, we know that recent economic growth, which has been anemic in any case, has accrued mostly to those who were already well-heeled, leaving stagnation or worse for many Americans. But why is this a problem?
Why am I hurt if Mark Zuckerberg develops Facebook, and gets rich on the proceeds? Some care about the unfairness of income inequality itself, some care about the loss of upward mobility and declining opportunities for our kids and some care about how people get rich - hard work and innovation are O.K., but theft, legal or otherwise, is not. Yet there is one threat of inequality that is widely feared, and that has been debated for thousands of years, which is that inequality can undermine governance. In his fine book, both history and call to arms, Ganesh Sitaraman argues that the contemporary explosion of inequality will destroy the American Constitution, which is and was premised on the existence of a large and thriving middle class. He has done us all a great service, taking an issue of overwhelming public importance, delving into its history, helping understand how our forebears handled it and building a platform to think about it today.
As recognized since ancient times, the coexistence of very rich and very poor leads to two possibilities, neither a happy one. The rich can rule alone, disenfranchising or even enslaving the poor, or the poor can rise up and confiscate the wealth of the rich. The rich tend to see themselves as better than the poor, a proclivity that is enhanced and even socially sanctioned in modern meritocracies. The poor, with little prospect of economic improvement and no access to political power,
might turn to a demagogue who would overthrow the government - only to become a tyrant. Oligarchy or tyranny, economic inequality meant the end of the republic.

Some constitutions were written to contain inequalities. In Rome, the patricians ruled, but could be overruled by plebeian tribunes whose role was to protect the poor. There are constitutions with lords and commoners in separate chambers, each with well-defined powers. Sitaraman calls these
class warfare constitutions, and argues that the founding fathers of the United States found another way, a republic of equals. The middle classes, who according to David Hume were obsessed neither with pleasure-seeking, as were the rich, nor with meeting basic necessities, as were the poor, and were thus amenable to reason, could be a firm basis for a republic run in the public interest. There is some sketchy evidence that income and wealth inequality was indeed low in the 18th century, but the crucial point is that early America was an agrarian society of cultivators with an open frontier. No one needed to be poor when land was available in the West.
The founders worried a good deal about people getting too rich. Jefferson was proud of his achievement in abolishing the entail and primogeniture in Virginia, writing the laws that
laid the ax to the root of Pseudoaristocracy. He called for progressive taxation and, like the other founders, feared that the inheritance of wealth would lead to the establishment of an aristocracy. (Contrast this with those today who simultaneously advocate both equality of opportunity and the abolition of estate taxes.) Madison tried to calculate how long the frontier would last, and understood the threat to the Constitution that industrialization would bringmany of the founders thought of wage labor as little better than slavery and hoped that America could remain an agrarian society.