Tia Gong is because the chips become expensive
Chips abit because as cpu becoming more advance(smaller) they get more expensive to make, battery capacity going up YOY also so increasing abit also. While these two prices increase a little but also are kinda offset by technology advances that make them cheaper to produce over time
But the culprit is the ram and storage since they're getting siphoned by Data Center, PC ram price went up by 300-400%, PC SSD now also on the way to 200%-300%-400%
The market is also expecting mobile phone ram/storage to be more expensive, in the short term™
The best we can do is guess work since only those working in manufacturing knows the true price. But also should keep in mind there's lots of greedy opportunistic companies taking advantage of this ram/storage situation and price gouging more than they should
We have seen some brand/model that only increase modestly while other brand/model have outrageous hikes