Your Econ 101 class must've been far more definitive than my Econ 600 classes.<p>Econ 100 -- Keeping all other variables the same, if the cost of wages goes up, demand for workers goes down.<p>Econ 600 -- When wages go up, the other variables do not remain the same, so a useful comparison must analyze the second-order effects to determine the change in aggregate demand for workers.