As we know, the most sincere recommendation teachers can get is having students return for more and more lessons. You can take the numbers of lessons someone has taught and divide it by the number of students he has had, and this is the "lessons to students ratio". Let's call it LSR for short. Some people even go as far as saying that this is the only number that matters when selecting a teacher. Of course, even for good teachers, this number might be low if they still don't have a long track record, or if they've been in the process of rising their fees. Now, let's talk about records:

-I once found a professional teacher with more than 5K lessons (which makes him look good) and almost 1.5K students (which might also look good on surface). This gives him a LSR of less than 4. Since he's been around for more than 5K lessons, I guess we can trust this number is not going to change a lot. Not very impressive.

-On the other extreme, I once found a community tutor with 2.5K lessons and a bit more than 160 students, giving her a fantastic LSR of almost 16! I bet she's an amazing teacher.

I'm curious if someone has ever found a teacher with a LSR higher than 16.