At Marketplace, it’s our job to explain how marketplaces work. This week, we’re turning from traditional stock and financial markets to the in-person kind. As part of our new “Tricks of the Trade” series), we’re heading to five different markets in LA. Today, we’re taught how to navigate The Rose Bowl Flea Market by a pro. But first, we’ll look at how president-elect Donald Trump’s fiscal policies could impact government finances.