Giving children an extrinsic reward like money for success in tests is a good way to destroy their intrinsic motivation in the long run.
https://www.psychologytoday.com/us/...st/201806/motivating-children-without-rewards
OK, I read your article, and there are a few places in it that it says it does not always have to be a bad thing always, etc, like for larger tasks, and not everyday ones, or ones that take a long time and a lot of longer term work or or a lot more work and/or a lot more self-effort or self-discipline, etc, that rewards for those are not always bad, and maybe even sometimes should be done maybe, etc...
Sure every person should do a thing because they want to do it, and it's "fun" for them, etc, but let's be real here, like when they become real working adults later on in the real world kind of "real", etc, and that's what your really trying to prepare them for in reality, etc...
And, like I said, it needs to age and maturity appropriate, and not just for everyday things, that they need to be taught to always do anyway regardless, etc, but for things that take a lot of "hard work", or a "long time", etc, cause they should learn that they will, most times, be rewarded for that, etc, but like I said, if your child or teenager lacks maturity, and you have not been developing them thus far into any kind of real true maturity yet or thus far, etc, then maybe you shouldn't do it then or yet, etc, but then, you are going to have to turn them loose eventually, and if they are not prepared for the real true realities of the real world yet, then "who's fault is that", etc...?
And also like I said, you have to gauge your child appropriately, and make sure it is not corrupting them along the way either, etc, and may even have to withhold it from them sometimes, or deny them it sometimes, (the reward, etc) just because they are getting the wrong idea or attitude about it, etc, for yet another lesson in life, etc, that "that" can make you lose your rewards, etc...
You could also deny them if the job wasn't done exactly right, etc, and make them go back and fix it or change it before they get rewarded for a "job well done" also, to teach them those kind of lessons also, etc...
But, that being said, (and I think that is enough to make my point, etc) (although there is a lot more, etc), if they grow up with no real true preparation for the real world, etc, then I blame the parent for that, etc, cause they obviously didn't do there real job well enough at all the steps along the way, etc...
Proverbs 22:6- "Train up a child (right) in the way he (or she) should go (or be/do, etc): (for the real realities of the real world, etc) (hard work, self-discipline, etc) (whether you feel like it or not, etc) and when he (or she) is old, (or "older", more mature, etc) he (or she) will not (ever forget it or ever) depart from it (ever)."
God Bless!