The best explanation of the given scenario using law terms is that Ted got Jamie to become more productive under false pretexts.
This refers to the use of false representation in order to get someone to do something or give out somethinng.
Hence, in this case, Ted made use of false pretext of a trip to motivate his friend Ted to take his studies and this works for him, but at the end of the semester, he finds out that there is no trip.
Read more about false pretexts here:
https://brainly.com/question/1373250