Probably volatility, because who wants to pay 3$ for a big mac, then the next day it is 1$, and then the next day its 6$. People don't want every day to be a gamble with their entire bank account.
Who wants to pay 3.50$ for a gallon of gas, then the next day it is 3.20$, and then the next day its 3.90$? This was never resolved and sale of gas never went mainstream. The same is true for food prices, hotel rates, airfares and many other things.
Sorry for being sarcastic, but price fluctuations are just a symptom of the algorithm to adjust to demand and supply. Even gold, treasuries and real estate prices go up and down. People tend to forget how volatile our world and in fact the Dollar is. It all depends on the viewer perspective.
To "resolve" price fluctuations means interference, manipulation and in the end destruction of the market. This never ends good.