Simplify the following text for a Grade 16 native English-speaking person.
Original: The intellectual developments of the period included the creation of the economic theory of mercantilism and the publication of enduringly influential works of political and social philosophy , such as Machiavelli 's The Prince ( 1513 ) and Thomas More 's Utopia ( 1515 ) .
Simplified: The intellectual developments of the period included the creation of the economic theory of mercantilism and the publication of works of political and social philosophy , such as Machiavelli 's The Prince ( 1513 ) and Thomas More 's Utopia ( 1515 ) .