While walking home, you find a $20 bill on the street. This being your lucky day, you immediately treat yourself to dinner
at PF Chang's rather than eating old leftover pizza from your fridge. This type of spontaneous behavior is best described as:
Osunk cost fallacy.
altruism.
overvaluing the present relative to the future.
framing bias.

The spontaneous behavior exhibited in the scenario is best described as overvaluing the present relative to the future. This phenomenon occurs when individuals prioritize immediate gratification over long-term benefits or consequences.

For example, deciding to splurge on a fancy dinner with found money rather than saving it for future use exemplifies overvaluing the present. Individuals succumbing to this bias may prioritize instant rewards without considering the potential future value of the money.

Behavioral economics explores how people's decisions are influenced by different contexts, including how choices are framed. In the given scenario, the immediate satisfaction of dining out overrules the long-term benefits of saving the found money, showcasing the tendency to overvalue the present.

Learn more about Behavioral Economics here:

https://brainly.com/question/32601743