|Graph from Delta Dental|
You can complete their survey here as well!
Check out the graph they have put out showing the S&P 500 and tooth fairy gift amount over time. Given the close correlation, how much money a tooth fairy leaves is an accurate predictor of how well the economy is doing overall!
Or, one can consider the tooth fairy gift amount in terms of inflation; it is about 10% per year. Overall inflation in the US economy is about 2% per year. Health insurance inflation rate fluctuates between 2-4%. College tuition inflation rate is about 5%.