Toddlers are told they will get two marshmallows if they wait. This is like “you can have a headache now and, if you wait, might get something later, perhaps a

Toddlers are told they will get two marshmallows if they wait. This is like “you can have a headache now and, if you wait, might get something later, perhaps a punch in the face, perhaps a slice of pie, perhaps nothing.”