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You have 20 apples that you put into 5 boxes. “How many apples per box?” 20/5=4. Easy.
You have 20 apples that you put into half a box. “How many apples per box?” 20/0.5=40. You can see how 20 apples in half of a box implies 40 apples per full box.
You have 20 apples that you don’t put into anything. “How many apples per box?” 20/0=? What box? What are you talking about? How can you suggest that there are a number of apples per box when there’s no box to begin with? Lunatic!
Letting the market decide the rent will not magically create more housing, only make the existing housing in a high-demand place like Paris very expensive. The effect might be that it is easier to find an apartment, but only because you have forced the poor out of the city and moved the housing crisis further away from the city. Of course the landlords would be happy if they could charge some 3000€ per month for a small studio apartment in a dodgy neighbourhood, so of course the economists say this is a good idea, since line go up is good.