The article tests economic theories in Portugal from 1995 to 1999. It examines how factors like trade, capital, and labor affect regional productivity. The study looks at different regions and sectors to see if they are converging in terms of productivity. The researchers find that certain variables, like capital/output ratio and trade flow, influence productivity levels. They also analyze spatial effects on productivity in different economic sectors. Overall, the study contributes to understanding how regions and sectors in Portugal are developing economically over time.