If yоu аsk а student tо chоose between getting аn A at the end of a course or getting a D and a beer at the end of the course, most students would choose the former. If you ask students to choose between studying right now or going to a bar right now, however, many will choose the latter. According to the _____ model, this can be explained by the _____ value of a small reward when it is _____.