Most humans are motivated by money because well who doesn't want money. But fact still remains that people are not motivated solely by money. Olympiads are motivated for the glory of the sport. Teachers are motivated by the progress of their students. Capitalism i think made a generalized observation as compared to other economic models.
no wonder if it's like that. at this time, almost false is a measure of money. money is something that is really needed, not only people, but also the state makes it very important. So, sometimes a lot of money is a motivation for us to work hard.