Business4 1. "While noting that he was familiar with Orsi’s work, Werbach described the search for an ownership model as a challenge, noting that he was familiar with co-op structures and had a bunch of conversations about all of the different models of doing that—and they rapidly became a "swarm hole" for us: really hard, no good models to point to, couldn’t actually know what to do and meanwhile we were trying to build a product and organization." What's a "SWARM HOLE"? 2. "Over time, a greater percentage of what shapes our access to opportunity will be the “equity” from online feedback systems rather than in the credentialing provided by real-world institutions or the contact lists on our LinkedIn profiles. " What's "EQUITY" here? Is it "fairness" or "ownership of shareholders in a company"? 3. What are "CONSIDERATION SET", and "PLATFORM CAREER"? 4. What does "LETTERS" mean in "Collection of letters"? Thanks a lot in advance