In economics, Kondratiev waves (also called supercycles, great surges, long waves, K-waves or the long economic cycle) are supposedly cycle-like phenomena in the modern world economy.
Kuznets connected waves with demographic processes, in particular with immigrant inflows/outflows and the changes in construction intensity that they caused. Kuznets swings have been also interpreted as infrastructural investment cycles.
Juglar cycle is a fixed investment cycle of 7 to 11 years. Within the Juglar cycle one can observe oscillations of investments into fixed capital and not just changes in the level of employment of the fixed capital
This cycle is believed to be accounted for by time lags in information movements affecting the decision making of commercial firms.
A basic economic/business cycle usually consist of 4 stages: prosperity, recession, derpression and improvement.