The theory leads to the long cycle theory of war and seeks to explain trends between warring states in the past 500 years.

Feb. 2006 Pravda story on his solar cycle theory.

But, Mr. Stewart argues, if everyone believes in the cycle theory, most people will stay in the business, just waiting for that inevitable price rise.

"I'm not going to buy that vicious cycle theory," Young told The Detroit Free Press in 1987.

In this book Pareto presents the first sociological cycle theory, centered around the concept of an elite social class.

In a nutshell, long cycle theory describes the connection between war cycles, economic supremacy, and the political aspects of world leadership.

Kondratiev's economic cycle theory held that there were long cycles of about fifty years.

Sociological cycle theory argues that events and stages of society and history are generally repeating themselves in cycles.

He is best known for his contributions to the social cycle theory.

Spengler's work became an important foundation for the social cycle theory.