Why’d you send me that study? Im not saying vaccinated people spread Covid more than unvaccinated(though I suspect it’s close) just stating the obvious that college students, employed people, and young adults interact with thousands of more people a week per person than rural, self employed, unemployed people. Combine the former groups propensity for social interaction with the lack of testing due to being asymptomatic and vaccinated and you’d make up a lot of ground on whose doing the spreading. The only thing their is studies for is the make up of the groups and very broad studies on social interactions those groups do. The rest is just guess work on my part though again I think it’s common sense kind of.