Unlike the rest of the Phoenix metropolitan area, population density in central Phoenix dropped during the 1970s and 1980s. The primary cause was a decrease in the number of housing units. Rising vacancy rates contributed, but the increase in vacancy rates was similar to that of the entire metropolitan area. Between 1990 and 1995, population density rose in central Phoenix. A sharp decline in vacancy rates was a major factor in the turnaround, though the vacancy rate decline only matched that of the entire metro area. Another major factor in the increase in density was the rising number of people residing in prisons, homeless shelters, or on the streets.

Raising Arizona was the challenge of the 20th century. Sustaining Arizona is now the challenge of the 21st. A crucial part of that task is not just understanding today’s knowledge economy, but mastering it.
If the state makes this fundamental transition, the brief history of Arizona’s future will read simply: They succeeded in the second stage. Human capital took its rightful place as a chief component of competitiveness. As a result, the story will go, Arizona moved into the top ranks of economic leadership after years in the second tier. Equity and prosperity resulted too. Most important, the state was ready for the next stage of competition. This happy ending for Arizona, of course, has been envisioned repeatedly over time. And in fact, a variety of human capital policies and programs to achieve it are in place. However, many would say that human capital is an area of unfinished business for Arizona. The Arizona Minority Education Policy Analysis Center (AMEPAC) developed "To Learn and Earn" to highlight the issues and asked Morrison Institute for Public Policy at Arizona State University to support the effort with research and analysis. In turn, AMEPAC will present the issues to Arizona stakeholders for their feedback. This process will kick off a multi-partner series of policy action projects. The first results will be presented in November 2009 at the next human capital conference presented by the Arizona Commission for Postsecondary Education.