From what I understand of Warren's tax numbers: They're higher because its the income of 2 people required to pay for all the necessities, which is in part of the tax scale designed to catch higher earners.
Basically, the stuff costs more, but the lower end of the tax brackets aren't adjusted for inflation based off household income, as the tax burden has shifted to the middle class from the upper class.
Basically, the stuff costs more, but the lower end of the tax brackets aren't adjusted for inflation based off household income, as the tax burden has shifted to the middle class from the upper class.