>What's the biggest single factor that determines how much money the U.S. federal government will collect in any given year? For our money, it's Median Household Income. The chart below, which shows the relationship between median household income and the total receipts of the U.S. government for each year since 1967, the earliest year for which we have median household income data, shows why we think that.Here, we found that a simple power law relationship exists between the amount of median household income in the United States and the total amount of money that the federal government collects each year,...