During the Last Several Decades, the Size of the Trade

question 92

Multiple Choice

During the last several decades, the size of the trade sector (exports plus imports) of the United States has been

• A) increasing as a share of the economy.
• B) relatively constant as a share of the economy.
• C) declining as a share of the economy.
• D) increasing during periods of recession, but declining during periods of strong economic growth.

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Definitions:

Wavelengths

The spacing between consecutive peaks of a wave, particularly in sound waves or electromagnetic waves.

Flipbook

A book with a series of pictures that vary gradually from one page to the next, so that when the pages are turned rapidly, the pictures appear to animate by simulating motion or some other change.

Stroboscopic Motion

An optical illusion where continuous motion is represented by a series of short or instantaneous samples, as seen in motion pictures.

Motion Aftereffects

A visual phenomenon where exposure to a moving visual stimulus leads to the perception of motion in the opposite direction when the stimulus is removed.