sentences:  Then it was important to have a large contingent of rich people who could save a greater proportion of their income than the poor and invest it in physical capital.But now that human capital is scarcer than machines, widespread education has become the secret to growth" and that while "broadly accessible education" is difficult to achieve under inequality, education tends to reduce income gaps.Gordon wrote that such issues as 'rising inequality; factor price equalization stemming from the interplay between globalization and the Internet; the twin educational problems of cost inflation in higher education and poor secondary student performance; the consequences of environmental regulations and taxes ..." make economic growth harder to achieve.