The importance of non-linear relationships between attitude and behaviour in policy research

The relation between consumers’ attitude and behaviour is of importance in designing marketing and public policy measures. However, many empirical studies find only low effects of attitudes on behaviour. In this paper, we suggest that the conflicting evidence on the attitude-behaviour link is partly due to only extreme attitudes impacting behaviour. That is, possible non-linearities not detected by standard linear models could occur in the relationship between attitudes and behaviour. We present and compare alternative model specifications to assess the non-linear relationship. We test our view using empirical examples relating to the link between environmental concerns and the purchase of organic products, and the link between privacy concerns and the possession of loyalty cards. We find strong support for the appearance of a non-linear relationship between environmental concern and the purchase of organic products, while only weak support for such a relationship between privacy concern and the possession of loyalty cards. Copyright Springer Science+Business Media, LLC 2007