Note to Macbeth, Act 2, Scene 3, lines 4-5: "Here's a farmer, that hang'd himself on th' expectation of plenty."

Act 2, Scene 3, line 4.
The farmer's sins were hoarding and suicide. He had hoarded his crop, hoping that when a famine came the next year he would be able to extort high prices from desperate people, but he hanged himself when it was predicted that crops would be plentiful.