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A researcher's study of the text messages exchanged among a group of friends can be referred to as:
Abba Lerner
An economist known for his contributions to Keynesian economics, particularly his work on the theory of functional finance.
Adam Smith
An 18th-century Scottish economist and philosopher known for his theories on free market economies and the concept of the "invisible hand."
Karl Marx
A 19th-century philosopher, economist, and political theorist known for his critical analysis of capitalism and his influence on the development of socialism and communism.
Variable Costs
Costs that change in proportion to the level of activity or volume of output in production, such as raw materials and labor.
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