Because knowledge is currency. It opens doors to privilege and status in society. It also ensures incompetent people are not put into positions where they can do harm.
You mean measured knowledge acquired through a every specific way is currency. Someone who acquired the same knowledge on his own will be cast aside until he gets his certificate.
That's because the certificate is the value, not the knowledge itself. The knowledge is assumed. Without a certificate, the onus of verifying the required knowledge is now on the consumer or employer, and unsurprisingly neither of them want that, so of course knowledge combined with a respected certificate is worth more than just the knowledge itself.
That's not possible because of regulation. For occupations that don't relate to other people's life or death situations, or security in general, it's reasonable to assume if someone has a skill, they should be able to use it professionally regardless of how they achieved it.
> if someone has a skill, they should be able to use it professionally
Sure, but why would you hire an unlicensed electrician, or surgeon, or car mechanic, or builder, or elevator mechanic, or really anything that matters?
The only areas where this point becomes moot are in areas where certifications already are not an issue, i.e. in jobs that almost anyone can do.
>Sure, but why would you hire an unlicensed electrician, or surgeon, or car mechanic, or builder, or elevator mechanic, or really anything that matters?
You don't need a licensing system, you just need a reputation system. Like how bonds have a rating system; nobody's stopping you buying a junk bond, but the system makes it clear to you that it's a got a high probability of default.
And it's not even universally true, if you know American English it is perfectly useless in rural China or Japan or Central Africa.
EDIT: I'll add another example that won't upset the American audience.
Numbers in French.
We are used to the decimal system, it won't work in France, they count numbers using the vigesimal system.
So 84, 80 + 4 is quatre-vingt-quatre, 4 x 20 + 4.
My way of counting numbers, which is a basic requirements for kids aged 5, is completely useless in France, even though France is a close Neighbour of my country and we dealt with each other since the dawn of history.
Because knowledge is currency. It opens doors to privilege and status in society. It also ensures incompetent people are not put into positions where they can do harm.