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vestors’abilitytofi
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thereisproductiveRDa
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vestme
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exampleofthelatterTheRDproductivityestimatesdiscussedaboveobviouslyaveragedthegooda
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a
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i
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i
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ta
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oisymeasuresofRDco
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essoftheirvaluedistributio
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sforwardcitatio
sofferamorereliablemeasureofRDvaluesi
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ovatio
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adirecttestoftheuseful
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measuresasi
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umberofpate
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te
sityofcitatio
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