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Old money is "the inherited wealth of established upper-class families" or "a person, family, or lineage possessing inherited wealth." The term typically describes families wealthy for generations.
American locations such as Greenwich, Connecticut, Westchester County, New York, Long Island's Gold Coast, the Upper East Side of Manhattan, Boston's Back Bay and Beacon Hill, Wellesley, MA, Newport, RI, Grosse Pointe, MI, Chicago's North Shore (especially Kenilworth, Winnetka, Lake Forest and Glencoe) and Philadelphia's Main Line are associated with old money.
Wealth is described as assets held by an individual or household. It is an important dimension of social stratification because it may be passed from generation to generation, ensuring that a family's offspring will be financially stable. Families with "old money" use accumulated assets or savings to bridge interruptions in income, preventing downward social mobility.
Old money applies to those of the upper class whose wealth separates them from lower social classes. According to anthropologist W. Lloyd Warner, the upper class in the United States during the 1930s was divided into the upper-upper and the lower-upper classes. The lower-upper were those that did not come from traditionally wealthy families. They earned their money from investments and business rather than inheritance. In contrast to the nouveau riche, the upper-upper class was families viewed as "quasi-aristocratic" and "high-society". These had been rich for generations. They lived off idle inheritances rather than earned wealth.
During the early 20th century, the upper-upper class were seen as more prestigious.
Although many "old money" individuals are not ranked as high on the list of Forbes Top 400 richest Americans as they were, their wealth continues to grow. Many families increased their holdings by investment strategies such as the pooling of resources  For example, the Rockefeller family's estimated net worth of $1 billion in the 1930s grew to $8.5 billion by 2000. In 60 years, four of the richest families in the United States increased their combined $2–$4 billion in 1937 to $38 billion without holding large shares in emerging industries.
Economists assert that the largest transfer of income will be as the older generation leaves wealth to the baby boomers. Inheritance has been estimated to make up 6% of the US GDP each year. The current generation is wealthier than any generation before. This increase in wealth and inheritance indicates a rise of "old money" in American families. Stephen Haseler argues that America is becoming an inheritance culture in which much economic opportunity is from family inheritance and not personal achievement.