In the 1930s, the Soviet Union asked Nikolai Kondratieff, a  mathematician, to create a model that would “prove” that capitalism would fall and communism would endure.

The inevitable conclusion from Kondratieff's theory was that cyclicality was inherent in economics and would not be banished by communism.

Kondratieff studied economic history and reached the conclusion that  economics was better explained by technology than class struggle. 

He  observed that technology did not evolve linearly but rather in leaps every 50 to 60 years. Named for the mathematician who made it famous,  this pattern is called Kondratieff cycles or K-waves.

Below is a summary of each 'season' of 50-60 years. The world is currently in 'winter'. It would be very wise to invest accordingly.