⚖️ Subjective Value

The old puzzle

Water keeps you alive. Diamonds don't.

So why are diamonds so much more expensive?

Value isn't built in

Austrians argue value isn't a fixed property of a thing itself.

It's determined by what an individual actually wants, given their own circumstances, right now.

There is no "true" value sitting inside the object waiting to be discovered.

Thinking "at the margin"

Value is decided by your next unit — not the average of everything that exists.

Water is abundant, so one more gallon adds little to your life. Diamonds are scarce, so one more is worth a lot more at the margin.

That single word — margin — dissolves a puzzle that stumped economists for a century.

The same good, different value

Stranded in a desert, that logic flips instantly — a bottle of water becomes worth more to you than a bag of diamonds.

Nothing about water changed. Your circumstances did.

Try it: What's it worth to you right now?

Three situations, the same two goods. Pick which is worth more each time.

Rank water against diamonds in a city, in a desert, and when you already own ten diamonds. Nothing about either good changes between rounds — only your circumstances. That gap is the subjective theory of value. Open the What's It Worth Right Now? tool →

Quick check: According to Austrian economics, what determines an item's value?

1. The hours of labour that went into making it
2. What people subjectively want it for, at the margin — not an inherent property of the item ✓
3. A price set by the market regulator

Value is a relationship between a person and a thing in a situation — not an attribute of the thing on its own.

Quick check: Scenario: you're stranded in a desert. Which becomes more valuable — water or diamonds?

1. Diamonds — they hold their price everywhere
2. Water ✓
3. Neither changes

Same water, same diamonds, completely different answer. That flip *is* the subjective theory of value.

Next up

If everyone values things differently, how does a market ever agree on a price?