The Supply and Demand model describes how prices vary as a result of a balance between product availability at each price (supply) and the desires of those with purchasing power at each price (demand). The graph depicts a right-shift in demand from D1 to D2 along with the consequent increase in price and quantity required to reach a new market-clearing equilibrium point on the supply curve (S).
So this applies to everything from a normal market place to game economics..
A good example would be the ever changing market prices of the MapleSEA free market. The recent release of Maple Story Ep. 2 and the realease of the Maker skill caused the market treand to shift away from the usual scrolled weapons and dragon series to common ORES and JEWELS.
The Timeless and maker skill caused a sudden increase in demand of Diamonds and Power crystals, Time pieces and even some etc such as the dragon scale and the dragon spirits. With the new prices, alot of traders made a bunch of profit and most high lvl players are earning a fortune selling the TImeTemple Drops to players of lower lvl rank.