Perfect Tense

question 6

Multiple Choice

Perfect tense

• A) indicates that action is completed and is formed by using a helping verb along with the past tense form of the main verb ( have learned ).
• B) indicates that an action is ongoing and uses the - ing form of the main verb ( was learning ).
• C) cannot be used with irregular verbs.
• D) can be used only with the past tense of verbs.

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Definitions:

Marginal Utility

The change in satisfaction or utility a consumer receives from consuming an additional unit of a good or service.

Utility-maximizing

The economic principle that individuals or firms seek to get the highest satisfaction or profit from their resources and choices.

Quantity Demanded

The total amount of a good or service that consumers are willing and able to purchase at a given price level in a market.

Law of Diminishing

The principle that states that as one input variable is incrementally increased, there will be a point at which the added output per unit of input will start to decrease, holding all other inputs constant.