Year Percentage contribution to growth Period growth rate labor Increase in quality of capital 20% Improved technology 25% Years 1948–1973 3.99% Increase in quantity of labor 15% Increase in quantity of capital 44% Increase in quality of labor 11% Increase in quality of capital 5% Improved technology 25% Years 1973–1989 2.97% Increase in quantity of labor 31% Increase in quantity of capital 39% Increase in quality of labor 7% Increase in quality of capital 12% Improved technology 10% Years 1989–1995 Increase in quantity of Attributed to Libby Rittenberg and Timothy Tregarthen Saylor URL: http://www.saylor.org/books/ 2.43% 26% Saylor.org 95