What’s the market value of a resume?

I’m sure there is value in a resume, and it’s a market value.
I just don’t get the details, but I’m pretty sure of it.

Companies collect resumes for employing people for many different purposes (to work inside, to send them to another company to work there, to send them to another company to work in yet another company, to work in another company, …)

Job search engines are big collectors of resumes. Usually they are the key that opens the door to their offerings.

Resumes are sold and bought, they’re not open souce, but authors provide them for free!!