Time Series Tests of Structural Change among Innovation and Trade Liberalization in Mexico

This work analyzes if there has been a structural change in the flow of patents in Mexico, as a consequence of institutional reforms and economic policies. To explore the structural change hypothesis, time series models and unit root tests are used in both series of patents applications for the country's residents and nonresidents. The analysis indicates that misleading conclusions can be obtained if the presence of structural breaks is not taken into account. Results show until two structural breaks in each series that are widely linked with changes in the economic activity. However, the structural changes occurred in each series, disagree in the estimated breakpoint, for the residents' series it seems to occur before of the trade openness, meanwhile for the nonresidents the two break points are estimated after the trade openness. Intuitively, innovation activities become more important with the arrival of multinationals as a consequence of the liberal reforms. Our findings about the presence of two structural breaks characterizing the patents series would be indicating that the Mexican economy has experienced a process of technology learning due to the trade reforms implemented since the 1980s, a result in concordance with the theories that sustain that trade liberalization promotes economic growth. © 2010 Springer Science + Business Media, LLC.