Daniel has a plan, something like a diary about the future, who writes in a black board workbook. Occasionally, although the run of life will force him to browse back in the diary, he modified a few small things, some resolutions compromising, but he is experiencing a life that is convinced that he is successful and in a way happy. Suddenly, however, something Daniel did not count on in his diary plan. Portugal finds itself on the brink of economic collapse and suddenly the whole Daniel's plan is collapsing - he loses his work and roof over his head, his own family is alienating, his best friends from his childhood are moving away. Despite everything, however, Daniel is not going to give up and his will to start again seems to be invincible. When a friend Xavier just mentions the average index of happiness, Daniel begins to think not only about his own happiness, but also the values ​​that one leaves future generations. The average happiness index is an admirable novel about the indomitable optimist who fights to his last breath for his dignified life and for the happiness of those she loves. With its dramatic, realistically and in places and humorous story, David Machado ranks alongside the most talented narrators of his generation.