Innovation of Entrepreneurial Firms.

An empirical test is provided of the effect of the degree of obsolescence on the effect of firm size and monopoly profits on a firm's ability to innovate. Recent theory suggests that innovation depends on firm size and monopoly profits only if the firm conducts product improvement as well as new product innovation. This is due to the allocation of limited entrepreneurial attention between improving current products and innovating new products. Current products are subject to obsolescence and innovation requires technological opportunities. The firm conducts product improvement as well as new product innovation only if the degree of obsolescence is sufficiently low relative to the level of technological opportunity. This theory provides an explanation for previously unexplained empirical observations. We find preliminary support for the hypothesis that product improvement reduces the positive effect of firm size on new product innovation and sufficient product improvement may reverse the negative effect of monopoly profits on new product innovations. In addition, product improvement reduces the positive effect of technological opportunity on new product innovation. [ABSTRACT FROM AUTHOR]