Comment: 27 pages, 7 tables. Presented at The 84th Annual Conference of the Agricultural Economics Society at Edinburgh, UK. An Application to Retail Milk Demand. 84th Annual Conference, March, 2010, Edinburgh, ScotlandThis article introduces the Hedonic Metric (HM) approach as an original method to model the demand for differentiated products. Using this approach, initially, we create an n-dimensional hedonic space based on the characteristic information available to consumers. Next, we allocate products into this space and estimate the elasticities using distances. Our model makes it possible to estimate a large number of differentiated products in a single demand system. We applied our model to estimate the retail demand for fluid milk products.