Say you produce a good and you sell it for 100 USD the unit. You have a complete infrastructure, machinery, workers, and all the costs you can imagine. You are in the business, so selling this good for 100 USD pays all your expenses leaving a profit. Now imagine that every 4 years you need to reduce the price per unit 50%. You now have the same costs to produce the good + a projection of inflation for the next 4 years but you get half the money. What would you do? Increasing the good price to sustain your profit and maybe adding some value to face the next 4 years of inflation sounds like a good plan.

Once ppl realizes about this behavior, they can make money getting your product previous to the price rise. Speculation starts and your prices are pumped beyond what you projected for the next 4 years.

It's pretty straightforward. Take a look at the historical graphics.  It is impossible to ignore this pattern ...