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QUESTION 23 The break-even investment in the Solow model when there is population growth and technological progress consists of the amount of investment necessary to replace depreciating capital and provide capital for new workers. to keep capital per effective worker constant. to keep capital per worker constant. to replace depreciating capital and provide capital for new effective workers. QUESTION 24 Figure: The Evolution of the World Income Distribution 100 90 80 1960 Percentage of world population 8 68 82 10 20 30 40 50 60 70 90 100 GDP per worker relative to United States In reference to the figure above: which of the following statements is correct? From 1960 to 2008, there has been a substantial drop in the share of world population with relative income of zero to 10 percent. ii. In 2008, about two-thirds of the world's population lived in countries with less than 20 percent of U.S. GDP per worker. iii. From 1960 to 2008, there has been a decrease in the share of world population with relative income of 20 to 30 percent. Only i and ii are correct. Only ii and iii are correct. Only i and iii are correct. All of the statements are correct