You are right there are a lot more factors involved in pricing then simply money supply. That is something that gets overlooked when discussion the topics. For the last 40+ years, the supply/demand equation plays more into the role of pricing as compared to the expansion or contraction of the money supply.
As for your other questions, I will be doing a follow up article on this since some good points were raised by many.
One point regarding the chatbots is tied to the idea of a product being a tool. There are two factors here. The chatbot development (the product) and the cost to create (which is true for all software) and then what is produced by the tool (another output).
The input, like for like, of training is dropping like a rock. Training a GPT 3 level model costs a fraction of what it OpenAI paid near 3 years ago. Sure, GPT5 costs lot more but the performance is nowhere near the same.
On the output side, the cost per token is also dropping. That is one way the industry is measuring the cognitive units.