I can go with that. Parity takes many forms. To many, parity means all teams hovering around 8-8 over a given period of years. Instead, I think parity means 'parity in the method' or 'parity in opportunity.' Consider this . . . I give 100 people $1000 (not really) and tell them on November 1 at opening bell they can buy any stock they want. That doesn't mean all will end up with the same amount of money (parity). It means they had equal shot (parity) at doing research and analytics. That, IMO, is NFL parity.
I think part of the problem the NFL is facing, and will see alot more of due to recent events is when, using your scenario, the company that owns that stock wont sell to certain owners.
That is the problem some teams face when trying to obtain free agents. If they are a bad team, they need to pay more to acquire that quality player they need, assuming he doesnt just outright refuse to play for them.
I said earlier in the year that we were setting a bad precedent in allowing Fitzpatrick to seek a trade. Now the players are trying to move from a less competitive team to a perceived "better" team simply because they want to. We saw it with guys like AB and Jalen Ramsey now. It is a bad trend for the NFL to allow this to continue. These arent the only example, we've seen it when certain players refused to sign with the team that drafted them (Eli Manning for example)
In those cases teams do not have an equal opportunity.
The NFL also needs to examine deals between players and franchises that circumvent the salary cap, ie. Allegations about the Pats contracting with a company owned by Tom Brady.