I had a similar idea. In some places, the food banks operate on a bidding system. The food bank is subsidized by the government, and the bidding process is blind to reduce competition. The platform could be dormant until a pandemic or crisis arrives, and then the government can track which resources change which hands, allowing for a clean pay-what-you-can approach. This money could be tracked for taxation purposes. Without sellers dictating pricing, the system would, in theory, approach a need-based market. Or you could set-up a B-corp and use the board to dictate which connections get made between companies. I'm not sure how the second option would help with the government. Also there are obvious holes in these ideas, but I welcome any education that other users have to offer.