Which of the following does not apply to market system?
a. it ensures the availability of products that consumers want
b. it ensures that sellers decide to stay in business based on their profits
c. it ensures that sellers respond to changing needs and tastes of customers
d. it ensures that government intervention is always present

The option that does not apply to the market system is D. it ensures that government intervention is always present.

The market system is an economic system that consists in the exchange of goods and services for money at market prices. The direct participants of this market system are producers, buyers and consumers. Moreover, there is little government intervention. The economic system in which the government has more power is the centrally planned economy.  

a. competition with other nations.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.