It's a dynamic system and everything depends on everything else. Of course. But some people have the opportunity at time t-10, another at t-9, ..., t, and then

It's a dynamic system and everything depends on everything else. Of course. But some people have the opportunity at time t-10, another at t-9, ..., t, and then still have no results at time t+1. Or, labelling a huge category like "college" as an opportunity ignores the details about how good of an opportunity it is versus other things that could be done eith those resources.