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ACTUAL INVESTMENT: Investment expenditures that the business sector actual undertakes during a given time period, including both planned investment and any unplanned inventory changes. This is a critical component of Keynesian economics and the analysis of macroeconomic equilibrium, which occurs when actual investment is equal to planned investment. The difference between planned and actual investment is unplanned investment, which is inventory changes caused by a difference between aggregate expenditures and aggregate output. Should actual and planned investment differ, then aggregate expenditures are not equal to aggregate output, and the macroeconomy is not in equilibrium.

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AXIOM:

A basic precondition or assumption underlying a theory. Axioms are basic, unverifiable world view assumptions--including personal beliefs, political views, and cultural values--that form the foundation of a theory.
An axiom is a statement or notion that is unprovable, but presumed to be true. Axioms cannot be verified directly with real world data, and as such are largely accepted on faith. They comprise the world view of a scientific theory. Many axioms reflect religious beliefs, political ideologies, and views about the basic nature of humanity and the universe. Belief in a supreme, omnipotent, omniscience being is one such axiom. The notion that people are basically good (or bad) is another. The presumption that the universe abides by cause-and-effect relations is a key axiom for all of science.

While axioms cannot be verified directly with real world data, as is the case for hypotheses, they can be "checked" indirectly. Suppose, for example, dozens of theories that employ the same axiom generate hundreds of hypotheses that are refuted by real world data. The problem might rest with this axiom. If this axiom is then replaced with an alternative, and the subsequent hypotheses are supported by data, then the validity of the original axiom is even more suspect.

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