市侩 is a strongly pejorative noun describing a person who is vulgar, mercenary, and solely concerned with profit — a 'philistine' in the sense of someone with no taste or refinement beyond money. It's often used in literary or critical contexts to attack someone's character, implying they are crass and opportunistic, not just a shrewd businessperson. The English glosses 'broker' or 'crafty businessman' miss the moral condemnation; the closest cultural equivalent might be 'money-grubber' or 'vulgar materialist'.