I can explain it in terms for those fiercely proud of their ignorance.
You see, if they dont sell stuff, then they don;t make moneys. and moneis is how they make mony.
Now by selling more stock then the shelves get emptier and fill with moony. The umny in tern has babies, and the baby money grows into big money so that we can butcher it and have bacon with our eggs.
Anybody can see that.