He might suffer from a heart attack
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Vladek's obsessive hoarding is a constant motif through the story. Vladek continually had to scrounge for necessities during the war: there was always a scarcity of things. There was the constant fear of not being able to light a fire or not having enough salt to keep food from spoiling. In peacetime, Vladek cannot stop his compulsion to hoard these items even though they are plenty.