Risk
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In simple terms, risk is the possibility of something bad happening. Risk involves uncertainty about the effects/implications of an activity with respect to something that humans value, often focusing on negative, undesirable consequences. Many different definitions have been proposed. The international standard definition of risk for common understanding in different applications is "effect of uncertainty on objectives".
Firefighters are exposed to risks of fire and building collapse during their work.
Harbor sign warning visitors that use of the walkway is "at your own risk"
Economics
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Economics is a social science that studies the production, distribution, and consumption of goods and services.
A 1638 painting of a French seaport during the heyday of mercantilism
The publication of Adam Smith's The Wealth of Nations in 1776 is considered to be the first formalisation of economic thought.
The Marxist critique of political economy comes from the work of German philosopher Karl Marx.
John Maynard Keynes was a key theorist in economics.