Present Perfect Tense Is Used When an Action Started in the Past

question 38

True/False

Present perfect tense is used when an action started in the past but continues into the present, and is formed by placing 'have' before a past-tense verb.

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Definitions:

Marginal Revenue Curve

A graphical representation that shows how much additional revenue a firm will make by selling one more unit of a product.

Perfectly Competitive Firm

A company operating in a market where there are many sellers and buyers, the product is homogeneous, and there are no barriers to entry or exit.

Downward Sloping

Describes a line or curve on a graph that shows a decrease in value as it moves from left to right.

Average Total Cost Curve

A graph that shows a firm's per-unit cost (both fixed and variable) at various levels of output.