Week 37 Day 5: Hedonic Adaptation: The Happiness Treadmill

You upgrade from a Honda to a BMW. For 3 months, every drive feels special. By month 6, it is just your car. By year 2, you are eyeing the Mercedes. The BMW did not stop being a good car -- your brain adapted to it and set a new baseline. Now 'normal' is a BMW, and happiness requires something more.

The hedonic treadmill in purchases: (1) Phones. Each new iPhone is exciting for 2 weeks. Then it becomes just your phone. The dopamine hit from the new device fades, but the $1,200 is gone. (2) Houses. Upgrade from 1,500 to 2,500 sq ft. The extra space is exciting for a few months. Then you fill the rooms with stuff you do not need. Now you need 3,000 sq ft. (3) Vacations (the exception). Experiences tend to resist hedonic adaptation better than objects. A trip to Japan in 2019 still brings happiness when you recall it in 2025. The TV you bought in 2019 does not. (4) Income itself. People who earn $75,000 are not much happier than people who earn $50,000 in day-to-day emotional experience (Kahneman and Deaton, 2010). Above approximately $75,000 (approximately $100,000 in today's dollars), additional income buys 'life satisfaction' (how you evaluate your life) but not more daily happiness. What beats the treadmill: (a) Spend on experiences over objects (more resistant to adaptation). (b) Spend on time (buy back commute time, housework, tedious tasks). (c) Spend on others (giving activates sustained happiness circuits). (d) Invest the rest in VTI/SCHD, because financial freedom -- the option to stop working -- provides a form of happiness (autonomy) that does not adapt away.

Hedonic adaptation was formalized by Brickman, Coates, and Janoff-Bulman (1978) in the classic lottery-winners vs. accident-victims study, which found remarkably small differences in long-term happiness between lottery winners and paraplegics. Frederick and Loewenstein (1999) reviewed the evidence for hedonic adaptation across domains and concluded that adaptation is faster and more complete for material purchases than for experiential purchases, social changes, or health changes. Dunn, Gilbert, and Wilson (2011) identified the eight 'principles of wise spending' from the happiness literature: (1) buy experiences instead of things, (2) help others instead of yourself, (3) buy many small pleasures instead of few big ones, (4) buy less insurance (against over-planning), (5) pay now and consume later (anticipation provides utility), (6) think about what you are NOT thinking about (practical details of ownership), (7) beware of comparison shopping (narrows focus to comparable features rather than experiential quality), (8) follow the herd (when the herd points to experiences, not things). Kahneman and Deaton (2010) found the income-happiness relationship has a satiation point for emotional well-being (approximately $75,000 in 2010 dollars) but continues to rise logarithmically for life evaluation ('is your life going well?'). Killingsworth (2021) challenged this finding, showing a linear relationship between income and happiness in a larger sample using real-time experience sampling. However, both studies agree that the marginal happiness return per dollar of income decreases with income -- the first $50,000 matters much more than the next $50,000 -- which supports the financial independence insight: the utility of an additional dollar of spending declines, while the utility of an additional dollar of invested wealth (providing security, options, and autonomy) does not.