🧠 Psychology of Money · Lesson 6 of 8 · 8 min
Anchoring & Mental Accounting
⚓ Tell someone a stock 'used to be $100' and they'll treat $60 as a screaming bargain — even if it's wildly overpriced. The brain grabs the first number it sees and clings to it like a life raft, facts be damned.
💡 Key idea
Anchoring = clinging to an arbitrary number (like what you paid). Mental accounting = treating 'found money' as less real. A dollar is a dollar.
🧠 Why it matters
Two glitches here. ANCHORING: fixating on an arbitrary reference number (what you paid, an old high) and judging everything against it, instead of what something is actually worth NOW. MENTAL ACCOUNTING: treating money differently based on where it came from — blowing a tax refund or 'winnings' recklessly while guarding your salary, even though a dollar is a dollar. Both quietly distort decisions.
🌍 In the real world
💡 People will splurge a $2,000 tax refund on impulse buys they'd never make with $2,000 of 'salary' — identical money. And they'll hold a losing stock because it 'should' be worth what they paid, a number the market does not care about even slightly.
📌 Takeaways
- Anchoring: judging value by an arbitrary old number
- Mental accounting: treating found money as less 'real'
- The market only cares what it's worth now, not what you paid
📖 Terms in this lesson
Anchoring: Letting the first number you see (a sticker price, a past high) steer what feels fair.
Mental accounting: Treating money differently by where it came from, like blowing a bonus you'd never take from savings.
✅ Test yourself
Anchoring in investing means...
- Buying boats
- Fixating on a number like what you paid, instead of current value
- Diversifying
- A safe strategy
Answer: B · Fixating on a number like what you paid, instead of current value
You judge a price against a meaningless reference point rather than real present value.
Mental accounting explains why people...
- Save consistently
- Blow a tax refund they'd never spend from salary — same dollars
- Avoid all risk
- Read the news
Answer: B · Blow a tax refund they'd never spend from salary — same dollars
We irrationally treat money differently by source, even though a dollar is a dollar.
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