Welcome to the World of Behavioural Economics!
In your H2 journey, you learned about Rational Decision-Making—the idea that humans are like "Econs" (super-logical robots) who always weigh marginal costs and benefits to maximize their own utility. But in H3, we get real! Behavioural Economics explores why real people often act in ways that traditional models can't explain. Don't worry if this seems a bit "psychological" at first; it's actually just about adding a human touch to our economic theories.
1. Bounded Rationality: Why Our Brains Take Shortcuts
Traditional economics assumes we have infinite brainpower. Bounded Rationality suggests that our ability to make "perfect" decisions is limited (bounded) by our brain's processing power, the information we have, and the time available. To cope, our brains use "rules of thumb" or biases.
A. Loss Aversion
Loss Aversion is the idea that the pain of losing something is psychologically twice as powerful as the pleasure of gaining the same thing.
Example: Losing $10 feels much worse than the "happiness boost" you get from finding $10 on the floor.
This leads to three specific behaviors mentioned in your syllabus:
1. The Endowment Effect: We value things more just because we own them. Once an item is "ours," the thought of losing it (selling it) feels like a loss, so we demand a higher price than what we would have paid to buy it in the first place.
2. Sunk Cost Fallacy: A sunk cost is money or time already spent that cannot be recovered. Rational Econs should ignore these, but humans often keep doing something (like watching a boring movie) just because they "already paid for the ticket."
3. Status Quo Bias: Because we fear the loss that might come with change, we tend to stick with our current situation (the "status quo") even if a better option exists.
B. Salience Bias
Salience refers to how much something "stands out." Salience Bias occurs when we focus on information that is flashy, recent, or emotionally charged, while ignoring more important but "boring" data.
Example: You might be afraid of a shark attack (very salient/scary) while ignoring the much higher statistical risk of a car accident (not very flashy).
Quick Review: Bounded rationality means we aren't perfect calculators. We hate losing more than we like winning, we cling to what we own, we can't let go of past costs, and we get distracted by flashy information.
2. Bounded Will-power: The Battle with "Future You"
Ever promised to start a diet on Monday but ended up eating cake by Tuesday? That is Bounded Will-power. Humans often lack the self-control to act in their own long-term best interest.
Time-Inconsistent Preferences and Procrastination
We often have Time-Inconsistent Preferences. This means our "present self" wants immediate gratification, while our "future self" wants long-term success.
Present Bias: We over-value immediate rewards and under-value rewards that happen in the future. This leads to Procrastination—putting off the "cost" (studying) until tomorrow because the "benefit" (resting now) is more salient.
Analogy: Imagine a tug-of-war between a toddler (your present self wanting candy) and a wise old man (your future self wanting healthy teeth). Usually, the toddler wins in the moment!
Key Takeaway: We struggle to stick to our plans because our brains are hard-wired to prefer "now" over "later."
3. Bounded Self-interest: Why We Aren't Always Selfish
Standard models say humans only care about their own utility. Bounded Self-interest shows that humans often care about fairness and the well-being of others.
Giving Behaviour
Why do people donate to charity or tip at a restaurant they will never visit again? There are two main reasons:
1. Altruistic Reasons: You genuinely care about the other person's happiness. You give because you want them to be better off.
2. Non-altruistic Reasons: You give because it makes you feel good (the "warm glow" effect), or because you want to look good to others (reputation).
Did you know? Even if you give money to a charity just to get a tax break or a "thank you" plaque, it's still "giving behaviour," but it's considered non-altruistic because the primary motivation is self-benefit!
4. Nudge Theory: Using Quirks for Good
Now that we know humans have these biases, how can we help them make better choices? This is where Nudge Theory comes in. A "nudge" is a small change in the environment that influences behavior without forbidding any options or significantly changing economic incentives.
How Nudges Work
1. Using the Status Quo Bias: Governments can make the "good" choice the default option. For example, if you are automatically enrolled in a retirement savings plan unless you "opt-out," most people will stay in because of the status quo bias.
2. Using Salience: Placing healthy fruit at eye level in a cafeteria (making it salient) while hiding junk food in a bottom drawer.
3. Overcoming Bounded Will-power: Sending text message reminders for doctor's appointments to combat procrastination.
Common Mistake to Avoid: A "nudge" is NOT a "shove." A tax on cigarettes is not a nudge because it changes the price (economic incentive). A law banning smoking is not a nudge because it removes the choice. A picture of a diseased lung on a cigarette pack is a nudge because it uses salience to discourage smoking while still allowing the person to choose to buy it.
Summary Table: The Behavioural Toolkit
Concept: Bounded Rationality
The Quirk: Our brains take shortcuts (Loss aversion, Salience).
The Result: We stick to the status quo or worry about sunk costs.
Concept: Bounded Will-power
The Quirk: We prefer "Now" over "Later."
The Result: Procrastination and failing to save for the future.
Concept: Bounded Self-interest
The Quirk: We care about fairness and others.
The Result: Charitable giving and cooperation.
Concept: Nudge Theory
The Application: Designing choices to "help" the brain reach the best outcome.
The Result: Better policy outcomes (e.g., higher organ donation rates via default options).
Don't worry if these terms feel a bit overlapping! The key for your H3 exam is to be able to identify which specific bias is affecting a decision and explain how a "nudge" could potentially address it. You've got this!