economic models are often based on assumptions because​ they
Economic model Most economic models rest on a number of assumptions that are not entirely realistic. For example, agents are often assumed to have perfect information, and markets are often assumed to clear without friction. Or, the model may omit issues that are important to the question being considered, such as externalities. Any analysis of the results of an economic model must therefore consider the extent to which these results may be compromised by inaccuracies in these assumptions, and a large literature has grown up discussing problems with economic models, or at least asserting that their results are unreliable.
Supply-side economics Supply-side economics is a macroeconomic theory that argues economic growth can be most effectively created by lowering taxes and decreasing regulation.[1][2] According to supply-side economics, consumers will then benefit from a greater supply of goods and services at lower prices and employment will increase.[3] It was started by economist Robert Mundell during the Ronald Reagan administration.