Only one person can own the chair at a time. Ownership of a chair can only be obtained from a current owner.
Many people can own (be able to use or give or not give to others) an innovation. Does everyone automatically own new innovations or do they need to obtain ownership from one of the current owners?
I'm unsure whether the standard concept of ownership can be made to apply to ideas at all, since it typically implies exclusive control, and ideas can be simultaneously "controlled" by multiple individuals without any one individual giving up their control.
Labor is similar. Everyone has access to labor. No one is allowed to use another's labor without their consent.
Everyone has access to discovery. Should people be allowed to use another's discovery without their consent?
I was assuming non-disclosure agreements. However anyone that heard the idea could use it without disclosing it OR people could hear the idea without signing such an agreement (hire someone to break a non-disclosure agreement).
So use a more thorough contract?
People that are not present when a contract is made, cannot be bound by that contract. A more though contract would prevent the people signing the contract from using the idea without permission. However the majority of the issue is about the actions of the 3rd party.
People tend to be reluctant to pay for positive externalities that hurt themselves. Innovation has lots of positive externalities that hurt the employer of the innovator. (Unless this externality is internalized in a trade) This is similar to the tragedy of the commons.
I don't think that comparison is accurate. Investing in new ideas offers the potential for direct benefit to the company which does so. It is fully justifiable by self-interest.
Investing in an innovator would cost wages[ - ], provide the company access to the idea[ + ] and provide the competitors access to the idea[ - ].
It is true that the tragedy of the commons dealt with objective loss rather than relative loss. I am not sure if that affects my point. People tend to be reluctant to cause themselves to suffer relative loss.