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LIQUIDITY: The ease of converting an asset into money (either checking accounts or currency) in a timely fashion with little or no loss in value. Money is the standard for liquidity because it is, well, money and no conversion is needed. Other assets, both financial and physical have varying degrees of liquidity. Savings accounts, certificates of deposit, and money market accounts are highly liquid. Stocks, bonds, and are another step down in liquidity. While they can be "cashed in," price fluctuations, brokerage fees, and assorted transactions expenses tend to reduce their money value. Physical assets, like houses, cars, furniture, clothing, food, and the like have substantially less liquidity.

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Lesson 2: Economic Science | Unit 3: Verification Page: 10 of 20

Topic: Evaluation <=PAGE BACK | PAGE NEXT=>

Ceteris Paribus Assumption:
In order to test an hypothesis we need to keep constant other factors that may affect it. Other things are called ceteris paribus factors.

The last step in the process is to evaluate the hypothesis. We have two possibilities-data and hypothesis agree-- data and hypothesis don't agree.

The data and hypothesis agree.

  • Because we can not prove an absolute, this possibility gives us support for the hypothesis, but not absolute proof that it is correct.
  • To get a proof, we need to test the hypothesis many times under several different conditions. But even then, we can not be 100%, absolutely certain.
  • With growing certainty of the validity of the hypothesis, it becomes a principle and is added to the theory for an expanded theory.

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KEYNESIAN MODEL

A macroeconomic model based on the principles of Keynesian economics that is used to identify the equilibrium level of, and analyze disruptions to, aggregate production and income. This model identifies equilibrium aggregate production and income as the intersection of the aggregate expenditures line and the 45-degree line. The Keynesian model comes in three basic variations designated by the number of macroeconomic sectors included--two-sector, three-sector, and four sector. The Keynesian model is also commonly presented in the form of injections and leakages in addition to the standard aggregate expenditures format. This model is used to analyze several important topics and issues, including multipliers, business cycles, fiscal policy, and monetary policy.

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