When Infants Are Held Upright Over a Treadmill

question 58

Multiple Choice

When infants are held upright over a treadmill

• A) most 3-month-olds demonstrate alternate stepping.
• B) most 6- and 7-month-olds demonstrate alternate stepping.
• C) only 10-month-olds demonstrate alternate stepping.
• D) only infants who could walk already demonstrate alternate stepping.

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Definitions:

Short Run

Describes a period in which some factors of production or inputs are fixed, limiting the ability of a business to fully adjust to market changes.

Long Run

A period in which all factors of production and costs are variable, and firms can adjust all inputs.

Inputs Fixed

Refers to factors of production (like capital and land) that remain constant in quantity, regardless of the level of output.

Inputs Variable

Factors of production such as labor, land, and capital that are used to create goods and services.