'Marketing Behaviour explores the nature of buyer psychology and its influence upon buying behaviour in the context of marketing. This unit provides a broad understanding of the factors and psychological processes shaping buyer behaviour in both consumer and business-to-business marketing. Such knowledge is crucial for understanding how marketing works in the real world, as well as the strategies and tactics that organisations use to influence their customers. The topics covered in the unit will be used constantly in later higher-level marketing units.'
(http://www.open.edu.au/courses/business/swinburne-university...

Trattandosi di un corso di Marketing, lo ometterei dal titolo.
Se proprio vuoi, però: Marketing e comportamento/i di acquisto (o d'acquisto, naturalmente)

Puoi utilizzare "comportamento" sia al singolare che al plurale. A titolo di esempio, vedi:
http://romebusinessschool.it/comportamenti-d’acquisto-nei-me...
e
http://www.unisa.it/uploads/6241/fondamenti_di_marketing_5_6...


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Note added at 2 days3 hrs (2012-11-24 06:03:16 GMT) Post-grading
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Ciao, Pasquale, e grazie!