(2) We do not fully consider various levels of aggre-gation at which data may be available. In prac-tice, customer data may be offered by a vendor in“blocks.” This will be an interesting and relevantextension
该文章认为当数据以块的形式被提供的时候,是一个有趣的研究扩展。这和DirectMail.com的数据提供方式是一致的,所以这个研究现在很有意义