Jacob van Gelderen
Encyclopedia
Jacob van Gelderen was a Dutch
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

 economist
Economist
An economist is a professional in the social science discipline of economics. The individual may also study, develop, and apply theories and concepts from economics and write about economic policy...

. Alongside Samuel de Wolff, he proposed the existence of 50- to 60-year long economic super cycles, now known as Kondratiev wave
Kondratiev wave
Kondratiev waves are described as sinusoidal-like cycles in the modern capitalist world economy...

s.

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