WFC: importance of following how markets expand.10.22.20 Even if you have no interest in Wells Fargo, there are great examples here of how a market expands and contracts and the market dynamics around this that can help you in almost any market. When markets become contracted, they are much more difficult to trade. In extreme contraction can be called a coil, and these should not be traded. However, markets work themselves out of coils by attracting alternatively buyers and sellers. The video addresses this.