The ideal target audience for any advertiser is a mass homogeneous group who share the same wants and needs. In theory, a homogeneous type of target group will allow the advertiser to address a large amount of potential costumers with less effort and resources than needed for a heterogeneous group of people. In practice, mass markets are often saturated and highly competitive.
To grow beyond mass markets, advertisers need to look for new “niche” targets. Expatriates, for example, are a very attractive niche, as they are looking for new products and services – and are not yet familiar with established national brands. In theory, you only have to get in front of them to sell your product.