Question content area

Part $1$

Which of the following is an example of a duopoly$$ market?

A$.$

The city of Kelowna has three major cab service companies.

B$.$

Visa and MasterCard exercise control over the electronic payment processing market in the world.

C$.$

DeBeers controls $70$ percent of the market share in diamonds and the rest is shared by a few other companies.

D$.$

$$Boeing$,$ Airbus, and Bombardier are the three aircraft manufacturing companies in the world.