>The point of a survey is to collect survey data, and if they don't do it, then it is that much worse of a survey, because there is no 100% substitute. Not 100

>The point of a survey is to collect survey data, and if they don't do it, then it is that much worse of a survey, because there is no 100% substitute. Not 100%, but I bet doing something as simple as looking at the bank accounts of the selected groups in aggregate (over a long time period) and adding in things like tax returns could get quite a bit of the way there. To be honest, I'm surprised something like mint.com or Personal Capital don't offer their own interest rate measures.