Measuring demand uncertainty is a key activity in supply chain planning. Of various methods ofestimating the standard deviation of demand, one that has been employed successfully in therecent literature uses dispersion among expertsacirc; forecasts. However, there has been limitedempirical...

We empirically examine the impact of expanded product variety on demand concentration using large data sets from the movie rental industry as our test bed. We find that product variety is likely to increase demand concentration, which goes against the “Long Tail effect” theory predicting...