The discovery issue per se was solved even before that. Request-based ("please send me your catalog, I truly want you to tell me about the products you manufact

The discovery issue per se was solved even before that. Request-based ("please send me your catalog, I truly want you to tell me about the products you manufacture and/or stock & resell") and ad-only "newspapers" (ask old rural folks if you don't know what I mean, or you can probably find a stack at the register or by the front door of any country diner or farm and feed store, if you can find such) cover it pretty well, and if you add computerization and the Internet to that formula, I'd say those cover it completely. Those require no unsolicited forcing-of-ads upon people, while still allowing plenty of advertising.