Revise Mistakes in decision-making for Cambridge 9990 (2.3.3)

The anchoring bias is a cognitive heuristic where individuals depend too heavily on an initial piece of information (the 'anchor') when making decisions. In consumer psychology, this first piece of data profoundly influences perceptions of value and willingness to pay. For example, a product's original price shown next to a sale price (e.g., 'Was £250, Now £150') anchors the consumer's judgement; the £150 seems like a fantastic deal relative to the £250 anchor, regardless of the item's intrinsic worth. Marketers strategically use high Manufacturer's Suggested Retail Prices (MSRPs) or place extremely expensive items at the front of a store to set a high anchor, making other, less expensive items appear more reasonable by comparison. This reliance on the initial anchor often leads to irrational purchasing decisions.

The framing effect demonstrates that how information is presented can significantly influence choices, even if the underlying options are identical. Decisions are affected by whether options are framed in terms of potential gains (a positive frame) or potential losses (a negative frame). This is closely linked to the concept of loss aversion, where people feel the pain of a loss more acutely than the pleasure of an equivalent gain. For instance, a packet of minced beef labelled '85% lean' (positive frame) is consistently preferred over one labelled '15% fat' (negative frame). Similarly, a '£5 discount for paying early' is less motivating than a '£5 surcharge for paying late', as the surcharge is framed as a loss that consumers are more eager to avoid.

The sunk cost fallacy describes our tendency to continue with an endeavour because we have already invested time, money, or effort—the 'sunk costs'. These costs are unrecoverable, and therefore should not factor into rational, forward-looking decisions. However, the psychological desire to avoid feeling wasteful or admitting a past decision was poor leads people to 'throw good money after bad'. A classic consumer example is continuing to pay for a gym membership that is never used, simply because one has already paid for the year. Another is finishing an unappetising, expensive meal at a restaurant. In both cases, the rational choice would be to abandon the course of action, as the money is already spent, but the fallacy compels continuation.

The overconfidence bias occurs when a consumer's subjective confidence in their judgements is greater than the objective accuracy of those judgements. In a purchasing context, this leads to an overestimation of one's knowledge, skills, or ability to predict outcomes. For example, a consumer might be overconfident in their ability to assemble complex flat-pack furniture, forgoing the professional assembly service only to end up with a poorly built item. This bias also manifests in financial decisions, such as overestimating one's ability to pay off credit card debt quickly, which can lead to excessive spending and accumulating interest. This lack of accurate self-assessment results in insufficient research, underestimation of risks and costs, and ultimately, suboptimal purchasing decisions.