Early European inhabitants of Pittsburgh were mostly farmers. In the late 1800s, Pittsburgh became known as a center for manufacturing and steel factories. Today, it has emerged as a center for medicine, education, technology, and banking. This progression is an example of
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• service redistribution according to the central place theory.
• the rise of global cities in the era of globalization and outsourcing.
• redistribution of U.S. jobs from primary and secondary sectors to tertiary.
• the relative economic advantages of countries with rank-size rule organization.
• predictions of business service distribution based on the gravity model.