this might not have occurred to you, so I'm going to do my best to explain as I understand it
I don't think bernie winning will change things the way people seem to be assuming when he proposes this stuff. people seem to think he's promising that things will magically improve. they won't. our congress is still made out of piles of shit, and corporations still have a foothold on their own interests over the publics best interest.
here's where it matters, and even if he doesn't win, still makes a difference: the long term effect of bringing these big issues to light. talking about solutions. showing people there are other (viable) ways of doing things. giving people hope. So no, it's not going to fix the economy overnight, but putting honest systems in place that have good intentions and punishing those that cheat the system, giving people proper healthcare and education, focusing on PEOPLE, will 100% in the long term 'fix' the economy.
right now we don't really have anything but a crooked system being gamed and manipulated by the ones already benefiting from it. we don't have capitalism, we have it's twisted cousin, where the deck is stacked in a specific way. We have loads of taxes and funds that should be used for public good, slipping through loopholes or being sucked up by middlemen.
so no, he won't fix the economy, not in the way you've set your comment up to project, but shining light on the issues we need to fix, the steps we need to take, to get there, is the most important thing he can do, and he's doing it as best as he can. We all need to pitch in.