Fact: The use of social application became ubiquitous in the urban quotidian of the 21st century.

Reflection: Is such ubiquity of social applications really efficient?

Travelling in the French capital, in the Catalan region and in the Swiss cantons, I imagined myself in one of those charming Cafés, at the end of a raining afternoon, talking with Pareto, Walras and Pigou about the social application impact under the perspectives of their theorems about efficiency, general balance and externalities – three primordial concepts in the classic economy.

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