How does word-of-mouth communication propagate knowledge that is currently in the possession of zero existing customers? Or operate for products that people have little reason to discuss with other people?
Suppose you sell insulation and replacing the insulation in an existing house could save $2 in heating and cooling for each $1 the insulation costs. Most people know that insulation exists, but what causes them to realize that they should be in the market for it when they "already have it"?
>Suppose you sell insulation and replacing the insulation in an existing house could save $2 in heating and cooling for each $1 the insulation costs. Most people know that insulation exists, but what causes them to realize that they should be in the market for it when they "already have it"?
The same legit things that can cause them to realize it today. Word of mouth, a product review, a personal search that landed them on a new company website, a curated catalog (as long as those things are not selling their placements).
An ad is the worse thing to find such things out - the huge majority ranges from misleading to criminally misleading to bullshit.
People don't need to discuss specific products, they only need to be aware of the existence of product categories. If it's genuinely the case that whole product categories are unknown to many people who could realistically benefit from them, as determined by a disinterested third party, an exception could be made for advertising that does not mention specific products or brands.
The insulation example can be solved by publication of data on average heating costs. When people learn that their neighbors are paying less they will be naturally incentivized to investigate why. Equivalent problems can be solved with the same general technique.