To what extent do inequalities in wealth accrue based on structural elements, such as tax deductions that only wealthy people can use, as distinct from factors pertaining to individuals, such as talent, sacrifice, and effort? The two clusters can build on each other, as people who have become rich primarily by exercising a talent and working hard use some of their accrued power to “reform” the system to their advantage at the expense of the poor and middle class. Such structural reforms in turn can make it easier for wealthy people to become even richer. In the context of a society in progress, structural and idiosyncratic factors doubtlessly interact—the trend being of an increasing chasm between the rich and poor.
The full essay is at "CEO Pay in Europe and America."