4. The inverted-U theory suggests that R&D expenditures as a percentage of sales ____________ with industry concentration
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4. The inverted-U theory suggests that R&D expenditures as a percentage of sales ____________ with industry concentration after the four-firm concentration ratio exceeds about 50 percent.
LO15.6
a. Rise.
b. Fall.
c. Fluctuate.
d. Flat-line.
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