Today in dynamic pricing

I have a chapter on dynamic pricing in my old book. In a nutshell: dynamic pricing is where the seller adjusts the current price upwards or downwards based upon the most recent information on market conditions. This is not the same as a cinema having discount Tuesdays, since it will offer that each week as a result of known factors about the demand for tickets. Dynamic pricing is where you make changes on the go, where the price change might be up or down, depending.
I suggested in the book tha