Having the ability to kill somebody before they were born is a recent medical advancement. Before that you had to simply accept what ever was born to you.

Dowry system has been going on India since ancient times. The system works like this. By and large Indian society still works in a system where your parents choose your spouse. So when a boy is of marriageable age, their parents go a matchmaker- and put forward their clauses. There are some typical things they look in a girl, The girl must be fair, beautiful, not taller than the boy, shy, and obedient. She must not be too intelligent, or bold or sometimes not working or well educated.

Apart from these behavior and cosmetic demands. They also put down financial clauses- Generally the demand is in gold, or real estate. Or a car, Or just hard cash. The demands for gifts never really ceases. Women are harassed, many women set themselves on fire unable to bear the torture and harassment. Dowry deaths are common and you will often hear of them in the news papers. In many cases women commit suicide, or worse there are cases where the mother in law burns the girl alive. As much as shocking to you all this may seem, it happens all the time here.

This has been happening since a long time. There are trends of these demands. If the boy is a doctor/Civil Servant the money demanded is highest, engineers/rich business men come next and so on... And this is so common, if you have to marry off your daughter you have to often pay up!

So you need to undo that much of cultural thing. I don't think it will go away anytime soon.

I guess the laws of supply and demand do not apply when ancient traditions are involved.

They do apply, just because there's fewer women than men doesn't mean they're on the supply side.

In traditional Indian culture daughters are seen as a deprecating asset that their parents want to get rid of.

Presumably the bribes dished out to get rid of them are less than their upkeep would cost if they weren't married off, with some added cost to account for the social stigma of having an unmarried single daughter.

Logically you would think this may help women but .. Let me explain. I come from a part of India which supposedly experienced bad sex ratio in 1920s-40s. I learnt from my parents and Grand Parents that the greedy parents of Women were 'selling' their daughters for higher money to older widowers. Also women were bought from other states. These were captured well in Telugu Drama 'KanyaSulkam' as an effort to get rid of evil. Apparently changes in sex-ratios don't result in correction of power balance.