I think maybe the businesses should be able to sell stuff. Perhaps the more members your business has, the better the stuff they can make.
The idea is something like this: Give each business an equal number of "work points" per day as the employees made by doing their jobs that day. The business owner can take the work points for the day and convert them to sell-able items. Anything could apply here; equipment, ECs, webs, etc ....
Then the business owner can post those items on the market. All proceeds go to the owner of the business.
Or, if you wanted, you could bring back stocks. Divide the money made from market sales between the stockholders.
I'll try to flesh this out later