Custom configurations on the other hand can take weeks or months to get from the factory to Sweden. Those who know what they want pre-order a car so that it's delivered when they want to replace their current car, which is usually every 3 years.
I bet Dell still keeps an inventory, it's just a vastly reduced one.
That's pretty common. I can walk into an Apple store and walk out with one of a variety of models. However, many memory and disk configs will have to be special-ordered and I'll have to wait a couple of weeks.
I expect if car selling moved to more of a BTO system, you'd see dealers/factory stores stocking some level of popular model/trim package/color combinations but everything else would be weeks to months to get.