Passage Summary: An essayist argues that because one study of fast-food joints showed no job losses after a pay raise, the big economic theory saying raises kill jobs must be wrong.

Conclusion: The economic theory of laissez-faire is not entirely accurate regarding its claims about the minimum wage.

Reasoning: A study showed that fast-food restaurants did not reduce their number of minimum-wage employees after a minimum wage increase occurred.

Analysis: The argument suffers from a classic 'part-to-whole' gap. It uses a single industry—fast food—to debunk a claim about the 'total number' of minimum-wage jobs. For this conclusion to hold water, the essayist must assume that the fast-food industry is a reliable proxy for the entire economy. If you want to find the necessary assumption, look for an answer that prevents other industries from having lost jobs while fast food stayed stable. If total jobs dropped even though fast food stayed the same, the laissez-faire theory would still be accurate, and the essayist's argument would fall apart.