Tables 1, 2, and 3 that follow present some data on three hypothetical economies. Complete the tables by figuring the measured productivity of labor and the rate of output growth. What do the data tell you about the causes of economic growth? (How fast are L and K growing?)

TABLE 1 GROWTH RATE OF OUTPUT Y/L. PERIOD L. 1,120 1,135 1,152 1,170 4,650 4,795 4,945 5,100 3,205 3,500 3,798 4,045 TABLE 2 GROW TH RATE OF OUTPUT PERIOD L. . Y/L 1,120 1,175 1,255 1,344 3,205 3,246 3,288 3,315 4,650 4,775 4,904 5,036