Firms' decisions about which goods to produce are often made at a more disaggregate level than the data observed by empirical researchers. When products differ according to production technique or the way in which they enter demand, this data aggregation problem introduces a bias into standard...

This paper examines the relationship between foreign ownership and productivity, paying particular attention totwo issues neglected in the existing literature - the role of multinationals in service sectors and the importanceof R&D activity conducted by foreign multinationals. We review existing...