What was not the cause of the great depression
a. overproduction
b. stock speculation
c. under consumption
d. foreign competition

C, under consumption

overproduction was a major issue as farmers industrialized

Stock speculation was a major issue, and the main cause of the great depression - People would invest in stocks without doing proper research.

Foreign competition, as a real 'global' economy developed, was a issue, and the world became extremely inter-linked as it is now; a economic crisis in one nation will affect countless others.

Under consumption was not really a contributing factor as people had more money to consume more items leading up to the great depression (1920's)