Markusen, James R.; Carr, David L.; Maskus, Keith E. - National Bureau of Economic Research (NBER) - 1998
What we term the firm includes three principal assumptions. First, services of knowledge-based and knowledge …. Second, these knowledge-intensive activities are skilled-labor intensive relative to production. These characteristics give …. Third, knowledge-based services have a (partial) joint-input characteristic that they can be supplied to additional …