Answer: For the real business cycle, technical fluctuation that triggers changes in outputs and employment, while for the Keynesian, income and output depend largely on the volume of employment.
Step-by-step explanation:
The real business cycle theory assumes that when the market undergoes variation in it's ability to turn inputs into product, there is a technical fluctuation that triggers changes in outputs and employment
While the Keynesian, it's sees business cycles as periodic fluctuations of employment, income and their output. This income and output depend largely on the volume of employment.