>You can have perpetual shortages on the supply side that keep prices up. The entire luxury goods market relies on this, as an example.
You'll have to go into more depth on your example. I'm not sure to what you're referring.
>But what about supply?
Reread the second paragraph in my comment. Generally, when the term "shortages" is used, it refers to supply.
As for the "perpetual shortages on the supply side that keep prices up", I'm not sure you are using the term "shortage" as it is understood in economics. Just because something is not available at a price I prefer does not connote a shortage (as defined in economics). Otherwise the fact that I cannot buy a Lotus car for $10k would mean there is a shortage. However, if the government introduced price controls on Lotus cars so they could only be sold for $10k, you would definitely have a shortage because more people would want them (demand) at that price point but no one would be willing to sell them (supply).