Prices going up and down: it's called "price fluctuation" and use to be driven by financial speculation. Prices and rates change as supply or demand changes. If something is in demand and supply begins to shrink, prices will rise. If supply increases beyond current demand, prices will fall. If supply is relatively stable, prices can fluctuate higher and lower as demand increases or decreases.
In the chart there are 2 Median Lines and 1 Fan - Dr. Alan H. Andrwes style - and... a smiling dog!
Maybe U can use the levels in this chart to track the future price fluctuations.