1. In 1920, there are 9 million private autos, one for every 12 people; in 1929, 26.5 million, 1 for every 4.6 people.
2. In the 1920s, US farmers have about 139,000 trucks and 246,000 tractors; in 1930, 900,000 trucks, 920,000 tractors.
3. Value of radios, radio equipment produced: 1921=$12.9 million; 1929=$388 million.
4. In the Twenties, horsepower per worker increases by 50% in manufacturing; 60% in mining; 75% in transport.
5. Output per worker increases by 72%, 1919-1929.
6. Gainful employment:no. employed in mining drops by 80,000
no. employed in agriculture drops 1 million
no. employed in manufacturing grows by 100,000
no. employed in construction grows by 800,000
no. employed in trade, finance, education, govt. grows by 3.8 million
no. of females gainfully employed grows by 27.4%
Immigration from abroad (not inc. W. Hemisphere):
1910-1914: 1.034 million per year
1925-29: 304,000
Between 1915 and 1928, 1.2 million African Americans leave the South for the North and West.
8. Average hourly wages in manufacturing 66.2 cts. per hour in 1923 to 71 cts. in 1928. Real hourly wages increase by 7%; real weekly wages by 2% (work week down 15% [59 to 50 hours], 1900-1926).10. Strikes
Year No. No of Workers % of employed wage earners on strike
1919 3630 4,160,000 20.8
1922 1112 1,610,000 8.7
1929 921 289,000 1.2
1925 1301 428,000 2.0
11. Union membership: 1920=5,034,000; 1929=3,625,000