Now that the precedent has been set, whereby a CB can buy it’s own debt, with new debt and no-one questions it, in that the mkts don’t drive its interest rates through the roof, it does look like there will no end.
However as u say at some point the multiple of assets to debt will apply, though God knows where…..but the other problem is u now have the likes of Sanders and AOC out there, who really do see magic money trees. Before too long one might get elected.