We analyze the relationship between firm size and innovation inputs in Taiwan, Two inputs are considered: R&D and technology imports. Building on an existing theoretical framework, we test this relationship by estimating bivariate Tobit models in twenty 2-digit industries, using a panel of 27,754 firms observed from 1992 to 1995. We find that, in all industries, R&D intensity and/or technology imports intensity depend strongly on firm size, following an "inverted-U" pattern. Moreover, we find that most industries are only "mildly Schumpeterian". Finally, our results provide some empirical evidence for complementarity between R&D and technology imports in the innovation process.