The number of shares has nothing to do with supply. Making “more shares” doesn’t increase supply. What happened with equities is that the dollar became worth

The number of shares has nothing to do with supply. Making “more shares” doesn’t increase supply. What happened with equities is that the dollar became worth less because their are more of them. This is true for everything else except for some physical commodities it is further exacerbated by some physical shortages (you aren’t wrong about a housing shortage but that doesn’t affect the second derivative here).