Why Did the Industrial Revolution Lead to a Growth in Marketing

Why did the Industrial Revolution lead to a growth in marketing research?

A) Manufacturers were producing goods for distant markets and consumers.
B) Colleges were teaching courses in marketing research.
C) Craftsmen and artisans of the day knew their customers.
D) Alfred Politz introduced statistical theory for sampling.
E) Growth was limited to the spread of government agencies and so most marketing research was performed for the government.