The article tests different economic theories in Portugal from 1995 to 1999. It looks at how factors like trade, capital, and labor affect productivity in different regions and sectors. The researchers found that there is a relationship between these factors and productivity levels. They also studied how different regions in Portugal are converging in terms of productivity, with some regions catching up faster than others. The study provides insights into how economic growth and development can be influenced by various factors at both regional and sectoral levels.