Breeding smaller humans

Suppose in the future (about 3-4 decades in the future), we start preferring smaller people as mates. The average size of a human would go down, maybe as far as or further than average heights from the middle ages, peaking not far above 140cm. This would mean that everything could be made smaller to better suit these smaller humans and so it would be easier to house more of them, less resources and land would be needed to cater to and feed them, and so more resources could be put towards other things like space travel.

What effects could this have on the way society functions? - assuming the world is similar to what it is today, but with the obvious improvements in technology. Could it lead to far larger populations that use up the same space as before? - or would it be a big step forward for the progress and advancement of the species?

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Breeding smaller humans

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