What curve represents the demand of all consumers in the market, taken together at different levels of the price of the good?

a) Monotonic

b) Indifferent

c) Market Demand

Option c) is correct.

It is because the market demand shows the quantity of output demanded by all the consumers in the market at the different possible prices at a particular period of time. The market demand curve is derived by the horizontal summation of individual demand curves, which provides total quantity demanded in the market for each specific level of price.

Explanations of other options:

Option a) is incorrect.

It is because an individuals or group of individuals can have monotonic preferences, which mean more of a good is preferred, but it is not possible for the assumption to shows the market demand.

Option b) is incorrect.

It is because indifference curves show those combinations of two goods that yield consumer a similar level of satisfaction. The curve shows how a consumer makes choices between two goods but not the quantity of a good demanded by each consumer in the market.