Its a romantic notion, making every transaction public. A theory. But, alas, not all humans and much of society appreciate knowing every single detail. And those that do will cause a political crawl so devastating as to invoke the reverse of its intention.

What's included in a transaction? Your name and address listed alongside all the medical treatments you pay for?

Companies can't sell user data if it's all public, right?

Organized and analyzed data would still be valuable. Maps are made from public data.