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A Robinson Crusoe economy is a simple framework used to study some fundamental issues in economics. [1] It assumes an economy with one consumer, one producer and two goods. The title " Robinson Crusoe " is a reference to the 1719 novel of the same name authored by Daniel Defoe .
In its most basic form it considers a simple economy consisting solely of businesses and individuals, and can be represented in a so-called "circular flow diagram." In this simple economy, individuals provide the labour that enables businesses to produce goods and services. These activities are represented by the green lines in the diagram. [5]
An economic model is a theoretical construct representing economic processes by a set of variables and a set of logical and/or quantitative relationships between them. The economic model is a simplified, often mathematical, framework designed to illustrate complex processes.
This makes analysis much simpler than in a general equilibrium model which includes an entire economy. Here the dynamic process is that prices adjust until supply equals demand. It is a powerfully simple technique that allows one to study equilibrium, efficiency and comparative statics. The stringency of the simplifying assumptions inherent in ...
In this simple economic model with a closed economy there are three uses for GDP (the goods and services it produces in a year). If Y is national income (GDP), then the three uses of C consumption, I investment, and G government purchases can be expressed as:
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A macroeconomic model is an analytical tool designed to describe the operation of the problems of economy of a country or a region. These models are usually designed to examine the comparative statics and dynamics of aggregate quantities such as the total amount of goods and services produced, total income earned, the level of employment of productive resources, and the level of prices.
A simple open economy model treating Big Macs as commodity goods implies that international price competition will force Norwegian, Egyptian, and U.S. burger prices to converge in price. The Penn effect, however, maintains that the general price level will remain consistently higher where (dollar) incomes are high.