Big Fish Small Pond

The BFSLPE (Big-Fish-Little-Pond Effect), first mentioned by Marsh and Parker in 1984, describes how people of equal compatibility have differen self-concepts, depending on the peers in their direct environment.
E.g. Students in low-socioeconomic (SES)/low-ability schools have a higher conception of their own abilities, than same ranking students in high SES/high-ability schools.

One common example mentioned is that of the highest achieving student in high school, who then becomes an average student in University. Most likely, because the highest achiving students all go to an equal high-ability university.

Source

• Marsh, H. W., & Parker, J. W. (1984). Determinants of student self-concept: Is it better to be a relatively large fish in a small pond even if you don’t learn to swim as well? Journal of Personality and Social Psychology, 47(1), 213–231. doi:10.1037/0022-3514.47.1.213

Sunken Cost Fallacy

Example: Not leaving a bad concert early, because you already paid money for it.

• The money/time/effort is motivating you from investing more. Even tough the ship has sunk.

False Dilemma