Which of the Following Firms Maintains a Monopoly or Cartel

question 29

Multiple Choice

Which of the following firms maintains a monopoly or cartel by controlling essential inputs thus creating a barrier to entry?

• A)DeBeers in diamonds
• B)Nike in shoes
• C)Pepsi in beverages
• D)Subway in sandwich fast food
• E)Levis in denim jeans

---

Definitions:

Paracrine Chemical Messengers

Substances released by cells that affect other nearby cells, allowing for local cell communication.

Placental LH-like Hormone

A hormone produced by the placenta that is structurally similar to luteinizing hormone (LH) and supports the corpus luteum, maintaining the production of progesterone during early pregnancy.

Trimester

A term describing a period of three months, often used to divide the nine months of pregnancy into three stages, each with its own developmental milestones.

Melatonin Secretion

The release of melatonin, a hormone regulated by the pineal gland, which influences sleep-wake cycles and circadian rhythms.