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Economics studies how people decide to use things that are limited. Land, labor, time, money, raw materials: none of these exist in endless supply, so every choice to use them one way is also a choice not to use them another. That trade-off sits underneath the whole subject.

The field splits roughly into two views. One looks closely at single decisions: why a household buys what it buys, how a firm sets a price, what happens to a market when supply tightens. The other steps back to whole economies, looking at total output, employment, the general level of prices, and the way money moves through a country over months and years. The small-scale view and the large-scale view feed each other, since national figures are just millions of individual choices added together.

Much of economics comes down to incentives. People respond to costs and rewards, and they change their behavior when those costs and rewards shift. A tax, a wage rise, a cheaper substitute, a sudden shortage: each one nudges decisions in a direction that can often be predicted, if not exactly measured.

It is not a precise science. Human behavior resists clean equations, and economists disagree, sometimes sharply, about what causes what. Still, the basic discipline of weighing costs against benefits and tracing the knock-on effects of a choice has proved useful well beyond money, shaping how people think about health, law, the environment, and ordinary daily decisions.