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I'm not from the US so don't really know what I'm talking about - but my impressions from this side of the pond are that MIT and Caltech seem to have rather different reputations from Harvard?

Probably proportionally based for each one.

Legacy applicants are X% more qualified naturally (well educated parents, etc), and get Y% from the admissions. Given the numbers for Harvard, MIT, etc, there are plenty of qualified applicants for each spot.

I would imagine that both MIT and Caltech have a higher acceptance rate for legacy for this reason. However a side effect of them not keeping track is that we will never have the breakout of those rates.

That's backwards reasoning.