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Macroeconomics is a branch of economics that deals with the performance, structure, and behavior of a national economy as a whole. Macroeconomists seek to understand the determinants of aggregate trends in an economy with particular focus on national income, unemployment, inflation, investment, and international trade. In contrast, microeconomics is primarily focused on the determination of prices and the role of prices in allocating scarce resources. In particular, the Great Depression of the 1930s led economists to try to understand its causes, and thus to be able to avoid similar situations causing such suffering in the future.

The term polygamy, literally many marriages in late Greek, is the practice of marriage to more than one spouse simultaneously. Like monogamy, where each person has only one spouse at a time, the term is often used in a de facto sense, applying regardless of whether the relationships are recognized by the state. Polygamy is condemned or restricted by the majority of the world's religions. Anthropologists have observed that, while many societies have permitted polygamy, the majority of human partnerships are in fact monogamous.