Innovation, imitation and open source

An extensive empirical literature indicates that, even without formal intellectual property rights, innovators enjoy a variety of first-mover advantages and that `imitation' is itself a costly activity. There is also accumulating evidence that an `open' approach to knowledge production can deliver substantial efficiency advantages. This paper introduces a formal framework incorporating all of these factors. We examine the relative performance of an `open' versus a `closed' (proprietary) regime, and explicitly characterise the circumstances in which an open approach, despite its effect on facilitating imitation, results in a higher level of innovation.