In the “High Progressivity” case, a lower income threshold is set at $7,500 (as in the “Weak Progressivity” case), with income above this threshold counting toward national capacity at a steadily rising rate, until it reaches an upper income threshold of $50,000, above which all income is counted towards national capacity. These settings increase the overall progressivity of the income calculation just as a graduated tax schedule raises the progressivity of an income tax