Final answer:
Sale-contingent signals are observations or actions that can provide clues about underlying circumstances or emotions. Examples include low selling prices in real-estate advertisements, horn honking at a stopped car, and a fearful dog running out of a door.
Step-by-step explanation:
Sale-contingent signals refer to information that can be inferred or confirmed from certain observations, such as low selling prices or specific actions. One example of a sale-contingent signal is seeing a low selling price on a house in a real-estate advertisement, which may indicate the presence of undesirable factors nearby, such as a landfill or factory. Another example is when a rear car starts honking its horn at a stopped car at an intersection, which signals frustration or impatience. Lastly, the sight of a dog running out of an opened door with its tail between its legs could indicate fear or anxiety. These examples show how observations can provide clues about underlying circumstances or emotions.