If this sort of discrimination was economically ineffective, you would see the market itself slowly adjusting towards a more efficient equilibrium, even without explicit laws.
It absolutely is in this case. The whole reason to target ads is to make the people who receive them more likely to engage with them. For instance, including men, elderly people, and children in the target demographic for a preschool teacher job advertisement would make that advertisement significantly less efficient, which is why it's not done.
Forcing companies to disallow targeting of ads because some people are offended by the population's job preferences is absurd.
The question is whether the side effects of artificially speeding up the process won't negate the original intent.
Also, the very fundament may be wrong. The authors of anti-discrimination statutes seem to be awfully certain of things such as "men can take care of babies in nurseries equally well as women can". We do not know if this is, in fact, statistically true. It is more of an egalitarian article of faith.
We should distinguish between formal legal disabilities ("Jews are prohibited from X by law") from informal discrimination that is the target of modern anti-discrimination law ("Sean Murphy does not want to employ any goddamn Englishmen"). Emancipation has a reasonably good, though not perfect, record. Anti-discrimination is a much newer idea which is much less proven in practice, though for plenty of people, it sounds convincing on paper.
If you look at the European Jews specifically, upon formal emancipation, they were able to establish themselves very quickly, both in business and the academia. In fact much of the subsequent 20th century anti-Semitism was borne out of jealousy of their success.
You won't find many aftereffects of the long-lived Chinese Exclusion Act or Japanese Internment Camps on the current well-being of Asian Americans either.
As for women, they are now outnumbering men in higher education by a considerable margin and, in the young cohorts, outearn them. By the logic of affirmative actions, there should be one for men probably...
It is true that not every group in the world was able to catch up once their shackles were released, but plenty of them actually were, and there was nothing magical about it.
Notably, the one exceptional group that mostly didn't catch up - American blacks - seems to be struggling even with all sorts of formal crutches constructed with the intent to help them. For example, the diversity programs at Harvard et al. seem to be mostly exploited by recent immigrants from Africa instead of generational American blacks.
It’s the paradox of tolerance - if you allow informal intolerance to fester it can metastasize into institutional and structural intolerance. But it’s quaint to suggest that economic market forces somehow themselves remove discrimination.
I don't think we know this, it is more of a fervent wish.
I don't judge things by economic effectiveness; slavery was economically effective at one time but it was still wrong.
Fair enough. I have seen attempts to justify anti-discrimination laws by very shaky economic research too often.
A moral stand is, as you say, independent of the economic ramifications, but as far as "outdated" things go, they may come back to fashion again. Given the current wild political swings between the left and the right, I wouldn't be surprised if at least some Western countries abolished or watered down their anti-discrimination statutes in the next decade or so.
I do understand that you think otherwise, I have met many people who see things differently.
The closest analogy I can find is the concept that commercial speech deserves less protection than private speech.
It is a matter of opinion and prevailing mores. In my opinion, becoming an employee is a voluntary decision (unlike, say, being drafted into a war), and should be treated the same as becoming a trade union member or a volunteer in a church organization.