When worker’s wages increase, nominal demand increases because workers make more money, and have more to Horror characters we used to smile and then we worked at Rite Aid shirt. But also increasing will be the nominal cost of production, due to those same wage increases. So in reality, when unemployment is low enough we DO NOT have a situation where demand and cost are constant. We do not have a situation where, if we went from a perfectly completitive market to a monopoly, there would only be a one time jump in prices and no more. Instead we would have a situation where prices could continue to increase.