Sala i Martin is one of the leading economists in the field of economic growth His works include the topics of
economic growth, development in Africa, monetary economics, social security, health and economics, convergence, and
classical liberal thinking, with his book
Liberal Economics for Non-Economists and Non-Liberals. The "liberal" in the title should be understood in the classic liberal/
libertarian sense. He has constructed an estimate of the world distribution of income, which he has then used to estimate poverty rates and measures of inequality. The conclusions of this study offered a new point of view for two reasons. Firstly, the
United Nations and the
World Bank used to believe that although poverty rates were falling, the total number of poor people was increasing. He claimed that both were falling. Secondly, the United Nations and the World Bank believe that individual income inequalities were on the rise. He claimed that they were not. Sala i Martin is the author of the economic growth textbook
Apuntes de Crecimiento Economico and the co-author (with
Robert Barro) of the textbook
Economic Growth. Sala i Martin and
Elsa V. Artadi are the authors of the Global Competitiveness Index, used since 2004 for the
Global Competitiveness Report, an index published by the
World Economic Forum that ranks 142 countries by their level of economic competitiveness. He often collaborates with Catalan media to support the independence of Catalonia from Spain. In 2014 he had a public confrontation with
José Manuel Barroso, the president of the European Commission, reproaching him the lack of support towards a democratic resolution of the conflict between Catalonia and the central government. ==Other activities==