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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. a.
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. a. Rise. b. Fall C. Fluctuate .d. Flat-line
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