No Bannon is horrible on economics. Just because he cares about the lower classes doesnt mean he knows anything about economics. He doesnt understand the concept of comparitive advantage which clearly outlines why trade is a good thing that benefits both parties regardless of how competitive they are. Thus he advocates closed borders and protection of unskilled tradeable sectors against foreigners with cheaper labour costs. He also is a 17th century luddite who doesnt understand how the jobs market works and the impact technology has. He is an economic illiterate and its dangerous if people believe he knows a bit about economics.
I didn't say he knew anything about economics, just saying what he has advocated for on the economic front is not your typical neo con trickle down stuff that Republicans (including the current lot) are usually famous for. His motivations for protectionism may have racist undertones, but I'm a supporter of a certain level of protectionism in trade policy.
Comparative advantage is all well and good but if it isn't passed onto the consumer (and comes at the expense of lower wages, conditions and employment for the lower classes) then I struggle to see the benefits.
Probably the biggest reason for Trump's rise was his anti-TPP stance. Globalization and free trade has left a lot of people behind in middle America. Even if you disagree on trade and borders with him. The rest of his economic ideology wasn't too bad.
However, obviously on race and other issues he was deplorable (and probably the main agitator behind rescinding DACA).