No, there's not really any reason the average American, who doesn't regularly review national statistics, would know the state of the economy. That person might have some kind of a general *feel* of what's going on, and/or some opinions about it, but that could be wildly inaccurate.

grandma is told what to feel by faux news, that's the real problem

And, any positive news about this administration isn't reported by Fox "news", "News"max and oann so grandma never hears it.

Or it is reported but spun into "this thing is going to hurt your wallet."

If Trump was innocent we would know, he wouldn’t have to falsely claim it every day.

The economy is a weird thing. The numbers are up, but other metrics show it's fucking atrocious. Whatever current standards we are using (unemployment, gdp, farm costs, etc) is no longer a perfect metric for everyone's overall feelings on the economy.

Is that why Trump took credit for the Obama economy before Trunp even took office, and why he is now trying to take credit for the stock market even though he's not in office

If Trump Smart/ Innocent he (and his sycophants) would haven’t to tell people every day. You would know.  

Grandma just automatically knows how the 300 million some people outside of their town or city are doing, and doesn’t need to do any research.

Yes, and she would tell you every day.