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The Paradox of Market Street

Week 1 Challenge | Deadline: Next Monday

“In the bustling city of Behavoria, on the famous Market Street, a peculiar experiment is taking place…”

The Scenario

Three shops opened on Market Street, each selling identical coffee mugs:

  • 🏪 Shop A: Sells mugs for $10
  • 🏪 Shop B: Initially sells mugs for $20, then offers a “50% discount”
  • 🏪 Shop C: Gives a free mug with every $15 purchase of anything else

The Mystery

After one month, these were the results:

  • One shop sold 500 mugs
  • Another sold 100 mugs
  • The third sold 300 mugs

Your Challenge:

  1. Match each shop with its sales volume
  2. Explain the psychological principles behind the results
  3. Identify at least three cognitive biases at play

Additional Clues:

  • All mugs are identical in quality and appearance
  • The shops are equally accessible to customers
  • Each customer bought exactly one mug
  • Marketing budgets were identical

Submit Your Answer:

Thinking Points:

  • How does the framing of price affect perceived value?
  • What role does “free” play in decision making?
  • How do reference points influence purchasing decisions?
  • What’s the impact of perceived savings vs. actual cost?
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Weekly Problem No 12. A unified model of human biases

Yildiz Culcu


Hi, I'm Yildiz Culcu, a student of Computer Science and Philosophy based in Germany. My mission is to help people discover the joy of learning about science and explore new ideas. As a 2x Top Writer on Medium and an active voice on LinkedIn, and this blog, I love sharing insights and sparking curiosity. I'm an emerging Decision science researcher associated with the Max Planck Institute for Cognitive and Brain Sciences and the University of Kiel. I am also a Mentor, and a Public Speaker available for booking. Let's connect and inspire one another to be our best!


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