For those saying that the reason this is done in advertising is because women make most of the purchasing decisions and the advertisers want to show them as smart/superior, I think that is BS.
Since sitcoms also frequently portray the husband as a buffoon, while his wife is the wise one, are we to also conclude that women make up the majority of sitcom viewers and the writers want to suck up to them?
Here’s my theory: Commercials, like sitcoms, want to be funny and quirky, most likely because they think that this creates memorable scenes that viewers are more likely to remember and thus have the brand imprinted in their memory.
One of the “funniest” things for humans is to make fun of other humans. That’s why in the old days there were so many jokes about Polish people, Irish, etc. In virtually every country, there is one class/race of people who are considered stupid and are the stars of many jokes involving stupid people. Now that some countries, like the US, are trying to be more politically correct, it is not considered proper to tell such jokes, at least not among people who are not your close friends (e.g. at work or among plain acquaintances).
Since it’s funny to have one class/race of humans be the butt of a lot of jokes (because then the joke builds on all the other jokes you heard about this class/race and makes it funnier) and since it’s not proper to make fun of women or minorities anymore, the only target left are males (usually white males, but in a black-only environment, it’s OK to make fun of the black males)
That’s why sitcoms and commercials now show men as buffoons and women as wise: because it is considered funny as part of a long running joke that men are stupid (like Polish jokes are considered funny as part of a long running joke that Polish people are stupid), and it is one of the last classes of people whom we can make fun of in polite company.
Some holes in the above theory
[ul]
[li]The existence, and acceptance by society, of “dumb blonde” jokes is a bit baffling. Why is it not OK to make fun of women in general but is OK to make fun of blondes? [/li][li]Several sitcoms from past decades also showed men as less smart than their wives, [/li]so this is not a wholly new phenomenon.
[/ul]
Despite the above holes, I think that, overall, that is why we see dumb men and smart women in ads today in the US, and not because of the purchasing power that women have.