Economists First Began Studying the Relationship Between Changes in Aggregate

question 181

Multiple Choice

Economists first began studying the relationship between changes in aggregate expenditures and changes in GDP

• A)in the 1950s.
• B)during the Great Depression.
• C)at the end of the Civil War.
• D)during the Industrial Revolution.

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Definitions:

Sympatric Isolating Mechanisms

Sympatric isolating mechanisms are barriers to breeding that occur when two species share the same habitat but develop behaviors or characteristics that prevent them from interbreeding.

Allopatric Isolating Mechanisms

Biological barriers that prevent species from interbreeding and producing fertile offspring when they are geographically separated.

Equilibrium Isolating Mechanisms

A term not widely recognized as a standard biological concept and may refer to mechanisms maintaining equilibrium in isolated populations; NO.

Hybrid Inviability

A post-zygotic barrier where hybrid offspring fail to develop properly or survive to reproductive age.