evidence: How does Sanders want to pay for it all? He would turn to the wealthy, Wall Street and corporate America. [...] To pay for it, Sanders would impose a 0.5% fee on stock trades, 0.1% fee on bonds and a 0.005% fee on derivatives. This would raise up to $300 billion a year, according to Warren Gunnels, his policy director, citing a 2012 University of Massachusetts Amherst report. [...] It remains to be seen how Sanders would pay for Medicare for All, which could cost more than all his other programs combined.