Plato on Justice and Happiness

According to Plato, how does the justice of the individual relate to justice in the city? And why does Plato think that justice makes the individual and the city ‘happy’ (i.e. why does he believe that justice is beneficial or pleasant?)? Are Plato’s accounts of the relationship between the individual and city, and the happiness of the just individual and city convincing? Why or why not?

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