Unsustainable: New Chart From Mercatus:
The graph compares spending by state and local governments to spending in the private sector by graphing each as a multiple of its 1950 level (all numbers are adjusted for inflation). The differences are startling: since 1950, private spending has increased 5-fold while state and local government spending has increased nearly 10-fold.

State and local governments, of course, receive their revenue from the private sector. In a word, this is unsustainable.