Though the gruff Sophist Thrasymachus attempts to pin down Socrates and force him to abandon his relentless question-and-Answer method, Thrasymachus is eventually forced to defend his belief that "might is right, and justice is the interest of the stronger."  
Set in the house of the wealthy aristocrat Cephalus, it begins as a discussion of the benefits of wealth.  Though the gruff Sophist Thrasymachus attempts to pin down Socrates and force him to abandon his relentless question-and-Answer method, Thrasymachus is eventually forced to defend his belief that "might is right, and justice is the interest of the stronger."  For 10 points-name this Platonic dialogue that introduces the concept of the philosopher-king and contains the Allegory of the Cave.
Set in the house of the wealthy aristocrat Cephalus, it begins as a discussion of the benefits of wealth.  
The Republic