3Congressional Budget Ofrice, Summary ofThe Budget and Economic Outlook:2016 to 2026, Janudry 2016.
4Russell Hardin. 1995. One for All. Princeton, NJ: Princeton University Press. pp. 35-37.
5Russell Hardin. 1999. Liberalism, Constitutionalism, and Democracy. New York: Oxford University Press.
6Robert D. Putnam. 2000. Bowling Alone: The Collapse and Revival of American Community. New York: Simon & Schuster.
7Pamela Paxton. 1999. "Is Social Capital Declining in the United States? A Multiple Indicator Assessment," American Journal of Sociology, 105 (1): 88-127.
8Mancur Olson. 1982. The Rise and Decline of Nations. New Haven, CT: Yale University Press.
9JosefJoffe. 2013. The Myth of America's Decline: Politics, Economics, and a Half Century of False Prophecies.
10Haas, Mark L. 2007. "A Geriatric Peace? The Future of U.S. Power in a World of Aging Populations," International Security, 32 (1): 112-147.
