I remember being taught in A-level history 10+ years ago that on top of this the economy was being fuelled by remilitarisation.

The conclusion we were given was that the bubble could burst if the stuff was made, then not used or needed, so potentialay Poland and France, Russia etc were invaded or in the case of Russia attempted) 5 years early or something to that effect.

I haven’t kept up with historical things for a while, and this take might have changed in that time. :)