The theory of keystone species in an ecosystem was first established in 1969 by Robert T. Paine. Pupils open the final lesson in a five-part series with a game guessing which member of the alpine ecosystem they are based on clues. After...

Economist Adam Smith supported free enterprise, he but critiqued mercantilism. These two ideas—seemingly contradictory—may be difficult for some young historians to grasp. A reading that explores these ideas guides scholars in unraveling...

Students conduct lab activities, computer visualizations, and other various forms of research in preparation for a role-play activity in which they assume the identities of advisors to various heads of state on the subject of global...

A report on trends in business cycles and characteristics which tend to show signs of future economic development. A question and answer session is also provided at the end of the report. The data is provided in an Excel spreadsheet,...

This essay by Dale C. Copeland entitled Economic Interdependence and War: A Theory of Trade Expectations discusses the realist and liberal points of view.

This site provides an analysis of the theory of demand, and determinants that can cause a shift or change in demand.

When the government increases the level of its spending, the effects will often go well beyond the spending itself. There will often be knock-on effects in the economy as well. To illustrate this, consider the example of previously...

Profile of Keynes excerpted from Daniel Yergin and Joseph Stanislaw's book on the evolution of the global economy, "The Commanding Heights."

Comments on Tversky's "Rational Theory and Constructive Choice," by Alvin E. Roth, Economics professor at Harvard. This paper was originally presented at the IEA Conference on "Rationality in Economics," IEA 16-18, 1993, Torino, Italy,...

This site provides a simple definition of market supply and the supply curve. Illustrates concept with a graph.

Biographical profile of the economist Lord John Maynard Keynes.