Here's a video defining the basic principle.

The opening sequence demonstrates hypergamy even though it shows the girl coming back to the original guy that gave her a flower it's just now that he has a bigger flower. It doesn't really show her moving on to other guys even though other guys are approaching her.

The rest of the video goes on about two guys on a basketball team but doesn't go on to demonstrate the negative aspect of this Pygmalion effect which is the basketball player reaches a point where he thinks he's so awesome and then moves on and might do this too quickly too many times (hyper) and eventually get left out in the cold. Same as hypergamous females.

The reason I'm so excited about this is because words like hypergamy have existed for hundreds if not thousands of years and it's sort of a recognized thing but it's very difficult to prove because it doesn't seem very scientific whereas this Pygmalion effect is scientifically studied and demonstrated repeatedly.

Further I believe this Pygmalion effect is recognized by almost everyone who holds back on giving people compliments because they just might "get and ego" about it.

However I have found the people but most men are so starved of any sort of encouragement and compliments that when we get one our dopaminergic centers like right up almost like we're in love. This is a very dangerous tool in the hands of the predatory female. And before you say it's a dangerous tool in the hands of a predatory male, well let's face it women still get more compliments than men.