This is what I meant by mental effort. With the advent of the Internet, most of these asymmetries are gated by at most a couple of hours of online research.
No there are a lot of asymmetries still. Knowing something is bad easy. Actually having access to something good, and knowing how to shop for it and acquire it and get it an affordable price, is hard. As is knowing, for the producers, that people want certain things and will pay for them, or would pay for them if marketed to correctly.
This is what I meant by mental effort. With the advent of the Internet, most of these asymmetries are gated by at most a couple of hours of online research.