A stock is cheap on every multiple. Why might that NOT be a long?

How to answer

Because it may be a value trap — cheap for a reason the market understands and you don't. Earnings may be in secular decline, the balance sheet may be impaired, capital allocation may be poor, or there's no catalyst to force a re-rate, so it stays cheap. Cheapness is necessary but not sufficient; I need a reason the gap closes and a view on why consensus is too pessimistic. If the low multiple correctly prices a deteriorating business, a low price just means more room to fall.

Key idea: Treating a low P/E as the thesis. The question is whether the E is real and durable, and what forces the multiple to re-rate.