The market concentration ratio: a. shows the percentage of total sales or production accounted for by the four largest f

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The market concentration ratio:
a.
shows the percentage of total sales or productionaccounted for by the four largest firms in anindustry.
b.
is a widely used, reliable measure of an industry’smarket structure.
c.
was developed by a Swedish and a German statistician inthe late 1890s.
d.
shows the percentage of total sales or productionaccounted for by the 10 largest firms in the UnitedStates.
e.
is so flawed a measure of an industry’s market structurethat it is almost never used.