Buyers need their own, preferably open-source, optimizers.

For nascent examples, see VRM (Vendor Relationship Management), buycott.com, Apple's papers on differential privacy for on-device data, digi.me and reputation schemes in grey/dark markets.

In existing markets, viral media is one of the few brand feedback mechanisms with low latency influence on decision systems, computer or human. But media has its own incentive problems.