Skill-biased technical change has occupied empirical economists for much of the 90s. However, the empirical literature has not progressed much beyond observing a positive correlation between technology indicators and demand shifts. Two hypotheses on the root causes of skill biases in technical...

In this paper I will focus exclusively on opportunity in the narrow sense and therefore on the origin of the required knowledge. For the purpose of this paper an opportunity exists when all reqiured elements of knowledge are "out there" and await the arrival of a keen entrepreneur to recognize,...