What Is Skin in the Game in Validation?

In validation, skin in the game is the real cost a person pays to signal interest in your idea — money, time, effort, or reputation. Evidence is trustworthy only when someone gave up something of value to provide it, because a costly action predicts future behavior far better than a free opinion.

Quick Answer: Skin in the game means the customer had to invest something real — a deposit, an hour, their email, a public referral — to express interest. The more it costs them, the stronger the signal. Opinions are free, so they predict almost nothing; commitment is expensive, so it predicts what people will actually do.

Every founder has heard an enthusiastic "I'd totally use that" and mistaken it for validation. The problem is that saying yes costs the speaker nothing. Alberto Savoia, who ran engineering experiments at Google and wrote The Right It, built his whole method around this gap: opinions are worthless as evidence because they are free to give. What you want instead is a costly action — proof that someone was willing to part with something they value.

This guide defines skin in the game as a validation concept, ranks the "currencies" people can invest, contrasts commitment with stated interest, and shows how to design any experiment so it demands a real cost.

How skin in the game grades your evidence

Skin in the game grades evidence by asking one question: what did this person give up to tell me they're interested? The larger the sacrifice, the more the signal deserves your trust. A costly action is a promise the future will keep; a free opinion is a wish that usually evaporates.

Free opinions are the weakest possible evidence. When someone answers a survey, likes a post, or says "great idea" in a hallway, they risk nothing. They can be generous, polite, or simply wrong about their own future behavior — and none of it costs them a cent. Savoia calls this the trap of "the opinion of the world": lots of encouragement, zero predictive value.

Costly actions are the strongest. The moment a person hands over money, blocks an hour on their calendar, or vouches for you to a colleague, they have exposed themselves to loss. That exposure is exactly what makes the signal credible. People protect what they value, so when they spend it on your idea, they are telling you something a survey never could. This is the core of separating signal from noise in validation: noise is cheap for the sender, signal is expensive.

The commitment currencies people can invest

People can pay you in several different "currencies," and Savoia's insight is that each one represents a real cost the customer chose to absorb. The type of currency, and how much of it they spend, tells you how strong the signal is. None of these currencies is fake — each demands that the person give up something they would otherwise keep.

Here is how the main commitment currencies compare, from lightest to heaviest.

Takeaway: More skin means a stronger signal. An email is worth more than a thumbs-up, a scheduled call is worth more than an email, a referral risks their reputation, and money on the table is the hardest currency of all to fake. Design your test to collect the heaviest currency the situation allows.

Skin in the game vs. stated interest

Stated interest is what people say; skin in the game is what they do at a cost. The two often point in opposite directions, which is why founders who trust words over actions build things nobody buys. A verbal yes and a paid deposit are not two points on the same scale — they are different kinds of evidence entirely.

Stated interest inflates. People overestimate their own future behavior and want to be kind to a hopeful founder. Ask "would you use this?" and you will hear yes far more often than the market will ever confirm. The answer is contaminated by politeness and imagination.

Committed interest deflates the fantasy. Ask instead "will you put down a refundable deposit to reserve one?" and the enthusiastic crowd thins instantly. That thinning is not bad news — it is the truth arriving early, while it is still cheap to learn. A smaller number of people who paid tells you more than a large number who nodded. This is what makes a signal count as a strong validation signal: it survived a cost.

How to add skin in the game to any experiment

You add skin in the game by redesigning your test so that expressing interest requires spending a currency. Instead of asking for an opinion, build a small gate that demands money, time, information, or a referral — then measure who is willing to pass through it.

A few reliable ways to raise the cost of a "yes":

• Ask for a deposit or pre-order. Even a small, refundable payment converts a verbal maybe into a monetary commitment. Money is the least fakeable currency.
• Require a real email to proceed. A waitlist that verifies the address filters out idle curiosity and captures people willing to be contacted.
• Make them spend time. A scheduled call, a booked demo, or a multi-step form costs attention — and people guard their time.
• Invite a referral. Ask an interested person to introduce you to one colleague. Staking their reputation is a costly, revealing act.
• Charge before you build. Savoia's "pretotyping" often means selling the promise first; a purchase against a product that doesn't exist yet is the strongest evidence there is.

The design principle is constant: never accept a free yes when you can price it. If you want the full sequence of tests to run, the complete guide to startup idea validation shows where costly experiments fit. Tools like Edmired can help you track which signals actually cost something, so your evidence log fills with commitments rather than compliments.

Key Takeaways

• Skin in the game is the real cost a person pays to signal interest. Money, time, personal information, and reputation are all currencies that make evidence trustworthy.
• Free opinions predict almost nothing. Because saying yes costs the speaker nothing, surveys and hallway praise are the weakest form of validation evidence.
• Costly actions predict future behavior. People protect what they value, so when they spend it on your idea, the signal is credible — this is Alberto Savoia's central lesson in The Right It.
• More skin equals a stronger signal. Rank currencies from light to heavy: information, then time, then reputation, then money at the top.
• Stated interest and committed interest often disagree. A verbal yes inflates; a paid deposit deflates the fantasy and delivers the truth early.
• Design tests that demand a currency. Add a deposit, a verified email, a scheduled call, or a referral so that interest can only be expressed at a cost.

Frequently Asked Questions

Why do free opinions make such weak validation evidence?

Because they cost the speaker nothing. When someone praises your idea in a survey or a conversation, they risk no money, time, or reputation, so their answer is shaped by politeness and optimism rather than real intent. Alberto Savoia argues in The Right It that only a costly action — where the person gives up something of value — reliably predicts what they will actually do.

Which commitment currency gives the strongest signal?

Money, in most cases. Cash is the hardest currency to fake, because once it leaves someone's hands they can't easily get it back, so a deposit or pre-order is powerful evidence. Reputation ranks close behind — a public endorsement or a warm introduction stakes the person's credibility. Time and personal information are lighter but still far stronger than a free opinion.

How do I add skin in the game without a finished product?

You sell the promise before you build the thing. Run a pretotype: a landing page with a real payment step, a waitlist that verifies emails, or a booked call to reserve a spot. Each gate forces the customer to spend a currency. The people who pass through it have given you costly, trustworthy evidence — long before you write a line of production code.

Does asking for commitment scare away real customers?

It filters, but it rarely scares away genuine demand. People who truly want a solution will pay a small deposit or spend a few minutes to get it; those who won't were never going to buy. A smaller group that committed is worth more than a large crowd that only nodded, because the commitment is what proves the interest was real.