Need Help Understanding Ownership Manifesto

I'm reading the Ownership Manifesto and I need some help understanding the following. :P

- What are "shared" values?
- What are "the propagation of shared values?
  • We should add features to give programmers more control over the ownership system, chiefly by allowing the propagation of "shared" values. This will be an opt-in change; it will largely consist of annotations and language features which programmers can simply not use.

Did you check the starting paragraph of this section: Shared Values?

Thank you!! oh it's in the lower part I didn't notice.