The objective of this study is to provide some empirical evidences on the existence of labor market adjustments according to smooth adjustment hypothesis (SAH) under the impact of intra-industry trade (IIT) considering the Portuguese case over a time span between 1995 and 2006. The main methodological issue of this study consists in showing that it is preferable to use the GMM-System approach with orthogonal transformation of data. The key outcome consists in highlighting a negative linkage between marginal intra-industry trade and the amplitude of employment changes for this particular market. In addition, we find a negative correlation between changes of employment and changes in domestic consumption. Moreover, the relationship between growth of productivity and market structure is according to smooth adjustment hypothesis.