MKTG1001 · Marketing Principles
Consumer Behaviour & the Buyer Decision Process
Consumer Behaviour & the Buyer Decision Process explains how and why people buy: the buying roles, the external influences (culture, social class, reference groups, family) and internal influences (motivation, perception, attitudes, learning), Maslow's hierarchy as the motivation lens, and the five-step buyer decision process with its evoked, inert and inept consideration sets.
This is Week 4 mid-semester material, examined through MCQs on the decision-process steps and the consideration-set vocabulary, and short questions that trace a purchase through the five steps. The marks come from naming the five steps in order, distinguishing the three consideration sets, and linking a marketing action to the right stage (e.g. reviews and awareness to enter the evoked set; onboarding and warranty to reduce post-purchase dissonance).
What this chapter covers
- 01Consumer behaviour = how individuals/groups select, buy, use and dispose of offerings to satisfy needs
- 02Buying roles: initiator, influencer, decider, buyer/purchaser, user
- 03External influences: culture & subculture, demographics & social class, reference groups & family, marketing activity
- 04Internal influences: motivation, personality, perception, attitudes, learning & memory
- 05Motivation and Maslow's hierarchy: physiological → safety → social/belonging → esteem → self-actualisation
- 06Perception (exposure → attention → interpretation) and sensory marketing; attitudes and change strategies
- 07The 5-step buyer decision process: need recognition → information search → evaluation of alternatives → purchase decision → post-purchase behaviour
- 08Consideration sets: evoked (will consider), inert (aware, ignored), inept (rejected); cognitive dissonance and loyalty
Extended-answer (Part B style): trace a purchase through the 5 steps
- 3 marksMove 1 — outline the theory. The five steps are need recognition → information search → evaluation of alternatives → purchase decision → post-purchase behaviour. In evaluation, brands sort into the evoked set (actively considered), the inert set (aware of but ignored) and the inept set (rejected outright).
- 2 marksMove 2 — apply the early steps. Need recognition: the old laptop dies. Information search: internal memory plus external sources — friends, online reviews, store visits — with more search the higher the perceived risk and price.
- 3 marksMove 3 — apply evaluation and purchase. Evaluation: the evoked set is three trusted brands; an inert brand is one they've heard of but skip; an inept brand burned them before. Purchase: they decide on weighted criteria (price and battery weighted heavily).
- 2 marksMove 4 — conclude with the marketing read and a limitation. Marketers fight to enter the evoked set (awareness + positive reviews) and to reduce post-purchase dissonance (onboarding, warranty). The process lengthens with perceived risk, so a low-risk repeat buy may skip steps — the model is a guide, not a fixed sequence.
Key terms
- Consumer behaviour
- The processes involved when individuals or groups select, purchase, use or dispose of products, services, ideas or experiences to satisfy needs and desires. It studies both the rational and emotional drivers of buying.
- Buying roles
- The different parts people play in a purchase: the initiator (suggests it), the influencer (shapes the choice), the decider (makes the call), the buyer/purchaser (does the transaction) and the user (consumes it). One person may hold several roles, or they may be split across a household or buying centre.
- Maslow's hierarchy of needs
- A five-level model of motivation — physiological, safety, social/belonging, esteem, self-actualisation — where lower needs are generally satisfied before higher ones drive behaviour. It supplies the motivation lens for understanding why a consumer wants what they want.
- Buyer decision process
- The five-stage path a buyer follows: need recognition, information search, evaluation of alternatives, purchase decision and post-purchase behaviour. High-involvement, high-risk purchases work through all five; routine purchases compress or skip stages.
- Evoked / inert / inept set
- During evaluation, the brands a consumer is aware of split into the evoked set (the shortlist they will actively consider), the inert set (brands they know but ignore) and the inept set (brands they have rejected and would not consider). Marketers fight to enter the evoked set.
- Cognitive dissonance
- The post-purchase discomfort of doubting whether the right choice was made, common after costly or high-involvement buys. Marketers reduce it with reassurance, onboarding, warranties and follow-up to build satisfaction and loyalty.
Consumer Behaviour & the Buyer Decision Process FAQ
What are the five steps of the buyer decision process?
Need recognition (a gap between actual and desired state), information search (internal memory plus external personal, marketing, public and experiential sources), evaluation of alternatives (comparing options on weighted criteria), the purchase decision, and post-purchase behaviour (satisfaction or dissonance, loyalty, disposal). Higher perceived risk lengthens the process; routine low-risk buys compress it.
What is the difference between the evoked, inert and inept sets?
All three are subsets of the brands a consumer is aware of. The evoked set is the active shortlist they will genuinely consider; the inert set is brands they know but feel indifferent about and skip; the inept set is brands they have actively rejected (a bad past experience, a poor reputation). The marketer's job is to get into the evoked set and out of the inept set.
How does Maslow's hierarchy fit into consumer behaviour?
Maslow explains motivation — the drive to reduce the tension of an aroused need. Lower-order needs (physiological, safety) are generally met before higher-order ones (belonging, esteem, self-actualisation) shape behaviour, so a marketer should identify which need level a purchase serves for the target customer and pitch the appeal accordingly. It links straight back to value (Ch 1) and forward to positioning (Ch 5).
How can marketers reduce post-purchase dissonance?
By reassuring the buyer after the sale: clear onboarding and instructions, warranties and easy returns, follow-up communication, and content that confirms they made a smart choice. Reducing dissonance turns a one-off buyer into a satisfied, loyal customer and lowers the chance of returns or negative word of mouth — which is why post-purchase behaviour is a full step in the model, not an afterthought.
Exam move
Lock down the five-step process in order and be able to define all three consideration sets — the evoked/inert/inept distinction is a recurring MCQ. For application questions, walk the named purchase through each step and attach a marketing action to a stage (awareness and reviews to enter the evoked set; warranty and onboarding to cut post-purchase dissonance). Keep Maslow's five levels ready as the motivation lens, and remember the external vs internal influence split. Close any answer by noting that perceived risk lengthens the process and routine buys shorten it, so the model is a guide rather than a rigid sequence.
