A LOCATION MODEL WITH PREFERENCE FOR VARIETY*
提出一个允许消费者从每家企业购买一单位产品的新区位模型，适用于报纸、信用卡等市场，发现空间差异化可能不是最大，甚至可能最小，从而恢复了霍特林的最小差异化原则。
We propose a new location model where consumers are allowed to make multiple purchases (i.e., one unit from each firm). This model may fit many markets (e.g. newspapers, credit cards) better than existing models. A common feature of these markets is that some consumers are loyal to one brand, while others consume more than one product. Our model yields predictions consistent with this observation. If firms are allowed to choose their locations on the interval, then spatial differentiation may not be maximal and in some cases it may even be minimal. Thus, under certain conditions, we restore Hotelling's Principle of Minimum Differentiation.