Here's an interesting bit from Tesla's 10-K, posted yesterday:
Our Tesla stores do not carry large vehicle inventories and, as a result, do not require corresponding large floor spaces. We believe the benefits we receive from distribution ownership, combined with our product design based on modularity and common platforms, will enable us to improve the speed of product development and improve the capital efficiency of our business. We believe that this approach provides us with a competitive advantage as compared to incumbent automobile manufacturers.