(1950, 1970, and 1980 in 1975 international dollars and

average annual percentage rates of change)

1950 1970 1980 1950-70 1970-80

Developing market economies 1,176 2,252 3,004 3.3 2.9

Low-income countries 566 813 880 1.8 0.8

Middle-income countries 1,296 2,539 3,432 3.4 3.1

Oil exporters 1,338 3,120 4,341 4.3 3.4

Relatively industrialized 2,347 4,765 6,839 3.6 3.7

Other 981 1,691 2,094 2.8 2.2

Industrial countries 5,951 10,590 13,723 2.9 2.6

Centrally planned economies 1,422 2,935 3,488 3.7 1.7

World 2,327 4,383 5,493 3.2 2.3

Source: Irving B. Kravis and Robert E. Lipsey, "The Diffusion of Economic

Growth in the World Economy, 1950-80," International Comparisons of

Productivity and Causes of the Slowdown, ed. by John W. Kendrick (1984),

Table 3-A3, p. 145. The 1980 estimates assume that labour force participation

ratios in 1980 were the same as in 1975. Reprinted with the permission of

The American Enterprise Institute for Public Policy Research, Washington, D.C.