Read through his website:
Share Corporate Wealth with Workers. Under this plan, corporations with at least $100 million in annual revenue, corporations with at least $100 million in balance sheet total, and
all publicly traded companies will be required to provide at least 2 percent of stock to their workers every year until the company is at least 20 percent owned by employees. This will be done through the issuing of new shares and the establishment of Democratic Employee Ownership Funds.
https://berniesanders.com/issues/corporate-accountability-and-democracy/
And then the financial transaction tax that he supports.. look what that did in Sweden:
During the first week of the tax, the volume of bond trading fell by 85%, even though the tax rate on five-year bonds was only 0.003%. The volume of futures trading fell by 98% and the options trading market disappeared. On 15 April 1990, the tax on fixed-income securities was abolished. In January 1991 the rates on the remaining taxes were cut in half and by the end of the year they were abolished completely. Once the taxes were eliminated, trading volumes returned and grew substantially in the 1990s.
https://en.wikipedia.org/wiki/Financial_transaction_tax
This stuff will have a pretty major, permanent impact on the market.