[yorwba]

> In many cases, advertising allows consumers to know about services and goods they might otherwise not know about.

I agree that advertising can help in that way, but I'm not sure how often that actually happens. The largest markets tend to be for products where everyone is generally aware that they exist (otherwise the market woulndn't be large) and most products are only differentiated by brand (e.g. fashion) instead of novel features. Because generic internet advertising follows the money, it ends up as a zero-sum game about moving market share between brands.

If there were a site that allowed only ads for completely novel products, or if the ad is just a link to a double-blinded study comparing along a measurable dimension against a competitor, I might subscribe voluntarily to be advertised to. Until then, HN comes close enough.