According to Jeff Bezos, founder of Amazon.com, the _____ refers to markets that are too small to justify a mass media campaign, yet too large to cover using personal contact.
a. hard middle
b. mass market
c. niche
d. Demographic market
Explanation: He describes the hard middle as a marketing campaign in which one doesn't get much profit per sale of product (usually inexpensive) to a not so large target audience.