Economic theory tells us that abnormal industry and firm profits will not persist for any length of time. Any industry or firm making profits in excess of the normal rate of return will attract entrants and this competitive process will erode profits. A substantial amount of research however,...

There are systematic long-run differences in the performance of firms explained by the R&D-strategy that each firm employs. Controlling for unobservable heterogeneity, past performance and other firm characteristics, this paper shows that labour productivity is, on average, 13 percent higher...

Economic theory tells us that abnormal firm and industry profits will not persist for any significant length of time. Any firm or industry making profits in excess of the normal rate of return will attract entrants and this competitive process will erode profits. However, a substantial amount of...