Walk down a suburban street in any developed industrialized nation and one thing will be remarkably constant: The letterboxes will be full, often overflowing. And they won’t just contain addressed, posted mail. The bulk of the material will often be brochures and flyers advertising businesses and services, many of them local.
Certainly, many people find this fact of modern life extremely annoying. Sometimes more than half the houses in a street will have signs angrily demanding that there be no junk mail!.
But this phenomenon proves something: Those flyers and brochures must be working! Otherwise businesses wouldn’t be paying to have them produced and distributed.