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9990 · 2.3.2

Choice heuristics — practice questions

Practice and worked examples for 9990 Choice heuristics. Short previews only — attempt the full question in MarkScheme against the official scheme.

Worked example 1

After seeing a news report about a phone battery fire, Priya avoids that brand despite its high ratings. She buys a more expensive unbranded charger believing 'price means quality', and chooses a cereal because its mascot looks 'healthy and natural'. Identify the heuristics used and evaluate their usefulness for consumer decisions.

Show solution outline

Phone — availability heuristic: Vivid news report makes battery fires easily recalledoverestimated risk for that brand (Tversky & Kahneman). Ignores statistical base rate (millions of safe units).

Charger — price-quality heuristic: Higher price → assumed better quality without checking specifications or reviews. May pay premium for identical components.

Cereal — representativeness heuristic: Mascot appearance ('healthy, natural') judged as representative of product quality → stereotype replaces ingredient analysis.

Evaluate — advantages: Heuristics save time and cognitive effort — adaptive for low-involvement purchases (2.3.1) where full analysis is impractical. Brand heuristic often correlates with genuine quality.

Evaluate — disadvantages: Systematic errors — availability distorts risk perception; price-quality exploited by marketers (2.2.2 decoy pricing). Vulnerable consumers — elderly, rushed shoppers rely heavily on shortcuts. Marketing exploitation — packaging and mascots designed to trigger representativeness (2.4.1). Heuristics are efficient but not optimal.

Worked example 2

A student needs a new laptop. They are choosing between two models:

  • Laptop A (BrandX): Costs $1200. The student has seen many memorable TV ads for it. It has a professional review score of 85/100.
  • Laptop B (LesserKnown): Costs $900. The student has not heard of this brand. It has a professional review score of 90/100.

The student is leaning towards Laptop A. Identify the heuristics at play and calculate the difference in 'value for money' based on the objective review scores to explain the potential error.

Show solution outline

Step 1: Identify the Heuristics

  • Availability Heuristic: The memorable TV ads for Laptop A make it more 'available' in the student's mind. This creates a sense of familiarity and positive association, influencing their preference.
  • Price-Quality Heuristic: The student is likely using the higher price of Laptop A ($1200) as a mental shortcut to infer it has superior quality compared to the cheaper Laptop B ($900).

Step 2: Calculate 'Value for Money' We can create a simple metric: Value = Review Score / Price. This gives us 'points per dollar'.

  • Laptop A Value Calculation: Value = 85 points / 12001200 Value = 0.0708 points per dollar
  • Laptop B Value Calculation: Value = 90 points / 900900 Value = 0.1000 points per dollar

Step 3: Explain the Potential Error The calculation shows that Laptop B offers significantly better objective value for money (0.1000 points/$ vs 0.0708 points/$). By relying on heuristics, the student is about to make a financially suboptimal decision. They would be paying an extra **300(300** (1200 - $900) for a laptop that is objectively lower-rated (85 vs 90). This demonstrates how heuristics can lead to systematic biases, causing consumers to ignore superior options and overpay for products.