Its important to note that in addition to supply-side forces increasing diagnoses, there are demand-side incentives as well.
I don't know how many parents are eager to put their kids on speed, but there are also accommodations provided by schools that they might very much want their kids to have. Like having the option to turn homework in late, or getting extra time on tests. Its worth noting that the option to turn homework in late is probably useless or worse for actual cases of ADHD, since it just moves the consequences of actions even further into the future, for people who have a deficiency in the ability to handle loose feedback systems (as opposed to tight feedback systems where consequences are immediate).
I don't know how many parents are eager to put their kids on speed, but there are also accommodations provided by schools that they might very much want their kids to have. Like having the option to turn homework in late, or getting extra time on tests. Its worth noting that the option to turn homework in late is probably useless or worse for actual cases of ADHD, since it just moves the consequences of actions even further into the future, for people who have a deficiency in the ability to handle loose feedback systems (as opposed to tight feedback systems where consequences are immediate).