Before crisis, companies can react to increased demand in a very smooth manner. Then if demand goes up, they will respond by increasing their supp i may be pulling some more workers into the factories that they are operating. If these supply chins are broken not only for one company, but across a whole range of companies then this could create a situation where prices go up even more than costs have gone up. And it might switch from being a system that has driven consumer prizes in the us down to being aSystem that enables the the sudden increase in prices.