Cumulative Share of income 900 80- 100 602 40- 30- 20 10+ line of equity 1970 2017 1435 + 0 10 20 30 40 50 159 70 80 90 100 Population quintiles 3. What has happened to income inequality in the years between 1935 and 2017? What could have caused this change in income inequality? Income Share of Cumulative Share of Cumulative Share of Cumulative Category Income in Share in Income in Share in Income in Share in 1935 (%) 1935 (%) 1970 (%) 1970 (%) 2017 (%) 2017 (%) First 4.1 4.\ 5.4 3.8 5.4 3.8 quintile Second 9.2 13.3 12.2 17.6 9.2 13 quintile Third 14.1 27.4 17.6 15.1 28.1 35.2 quintile Fourth 20.9 23.8 23.1 48.3 59 51.2 quintile Fifth 51.7 40.9 48.8 100 99.9 100 quintile