That is the question "Traders" ask every spare moment they have. Realise [because merely knowing is inadequate] that Supply & Demand is a superficiality anchored upon the human dichotomy that is Greed-Fear.
The answer to the question therefore is, "Where there is the means, a way will be afforded", Necessity being The Mother of Invention. As such, to get onboard the trail leading to the answer is to get lucky - that of Robbing Peter To Pay Paul. Most take that necessity as the command to make/screw more money in order to address the need.