It seems to me that the price of small (1 -2 seat) aircraft is effected by:
Factory Built - pretty much been on a rocket ride for the last 3-4 years
Kit Built - more like an express elevator.
In/Out of fashion - inexplicable popularity of some aircraft, has seen crazy prices, corresponding slower rise in the less well regarded/promoted.
CV19 causing massive disruption in World trade, may have been the catalyst ????
The Donald policies may likewise disrupt the ordered flow of goods, causing similar rises in material costs ????
Security instability, negatively impacting raw material supply, production, delivery, diversion of resources to military ????
Humans are consumers - price of goods goes up - wages rise to compensate - inflation spiral, always there, just faster at some periods.π