The Value of the Four-Firm Concentration Ratio That Many Economists

question 204

Multiple Choice

The value of the four-firm concentration ratio that many economists consider indicative of the existence of an oligopoly in a particular industry is

• A)anything greater than 10 percent.
• B)anything greater than 20 percent.
• C)anything greater than 30 percent.
• D)anything greater than 40 percent.

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Definitions:

P < .05

A statistical notation indicating that the probability of the observed results occurring by chance is less than 5%.

Effect Size

A quantitative measure of the strength of a phenomenon, often used to determine the practical significance of research findings.

Cohen

Refers to statistical measures developed by Jacob Cohen to quantify the effect size or the strength of an observed phenomenon, such as Cohen's d.

Cohen's D

A gauge for quantifying the size of impact by showing the normalized discrepancy between two mean values.