Economics

1916-

Federal spending:   $0.71 billion
Consumer Price Index:   10.9
Unemployment:   5.1%
Cost of a first-class stamp:   $0.02

- 1917

Federal spending:   $1.95 billion
Consumer Price Index:   12.8
Unemployment:   4.6%
Cost of a first-class stamp:   $0.02 ($0.03 as of 11/3/17)

1918

Federal spending:   $12.68 billion

Consumer Price Index:   15.1
Unemployment:   1.4%
Cost of a first-class stamp:   $0.03

1919

Federal spending:   $18.49 billion
Consumer Price Index:   17.3
Unemployment:   1.4%
Cost of a first-class stamp:   $0.03 ($0.02 as of 7/1/19)

1920 -

Federal spending:   $6.36 billion
Consumer Price Index:   20
Unemployment:   5.2%
Cost of a first-class stamp:   $0.02