I was thinking about this the other day, and I was wondering whether the fact that my kids are not exposed at all to commercials might make them more susceptible to advertising when they grow up.
So, my hypothesis is that exposure to ads does not have any benefits. I would not extend this hypothesis to product placement, however.
I suppose it's a good thing to teach. How else are kids supposed to know? How do kids who grew up with broadcast and cable ads learn to tell them apart?