Trickle Down Mathematics
A cute sounding phrase, which is 99.99% bullshit, that is used to justify the high royalties demanded by half-baked math authors in academia, or the high fees charged by most overrated textbook math consultants or general editors (who are notorious in giving cosmetic feedback to a manuscript).
Educational publishers in Singapore reluctantly give in to trickle down mathematics, hoping to increase the odds of their approved textbooks to be adopted by more local schools, by displaying as many PhDs on their book covers.