英文文献：Household Food Purchase Patterns: The Case of Vegetables-家庭食品购买模式:以蔬菜为例
英文文献作者：Dong, Diansheng,Stewart, Hayden
英文文献摘要：
A household’s purchase pattern for food can be described along three dimensions: how much food is bought, what types of food are bought, and how often food is bought. We have proposed a model in which these three facets of purchase behavior are simultaneously determined. Among other things, our model allows us to ask whether a household’s frequency of purchase influences how much food is bought on any shopping occasion. This was not possible with past studies. We find that, in fact, the more time has elapsed between purchases, the greater the quantity of product a household will buy on its next shopping occasion.

一个家庭对食物的购买模式可以从三个方面来描述:买了多少食物，买了什么类型的食物，多久买一次。我们提出了一个模型，其中购买行为的这三个方面是同时决定的。除此之外，我们的模型允许我们询问一个家庭的购买频率是否会影响在任何购物场合下购买多少食物。这在过去的研究中是不可能的。我们发现，事实上，购买间隔时间越长，一个家庭在下一次购物时购买的产品数量就越多。