What Is a Dominant Assurance Contract?
June 2, 2026
A dominant assurance contract is crowdfunding where backers are refunded plus a bonus if the project fails to fund, so backing is rewarded rather than penalized when a project falls short; Pieces brings it to digital content.
A dominant assurance contract is a type of crowdfunding contract where backing a project is the rational choice no matter what happens. If the project hits its funding goal, it gets made. If it does not, every backer is refunded their money plus a bonus. The mechanism was proposed by economist Alex Tabarrok as a fix for the free-rider problem in funding public goods.
The problem it solves
Ordinary crowdfunding has a quiet flaw. If you want a project to happen, the smart move is to wait. Let other people pledge first, see if it is going to succeed, and only commit at the last moment. But if everyone reasons this way, nothing gets funded. Economists call this the free-rider problem.
A dominant assurance contract removes the incentive to wait. Because you are paid a small bonus whenever the project fails, you are rewarded simply for backing it.
How it works, step by step
- A creator sets a funding goal and a deadline.
- Backers pledge money toward the goal.
- If the goal is met by the deadline, the project is made and backers get what they paid for.
- If the goal is missed, backers get a full refund plus a bonus.
That last line is the whole trick. In game theory terms, backing is now a dominant strategy: your best move regardless of what anyone else does.
How Pieces uses it
Pieces puts dominant assurance contracts to work for digital content. On Pieces:
- A creator locks a piece of content (music, art, writing, video, files) behind a funding goal, a deadline, and a kickback percentage. The content does not exist publicly until it unlocks, so it cannot leak or be pirated in advance.
- Backers pool money toward the goal. Backing is capped so the goal is never exceeded.
- Bonders stake their own money up front to stand behind the creator, up to a fixed bond target. They are the ones who fund the bonus.
The moment backing reaches the goal, the Piece funds instantly: the content is released publicly, the creator gets paid, and bonders earn the kickback. If the deadline passes without reaching the goal, the content stays sealed forever and backers are refunded their full amount plus a pro-rata share of the forfeited bonds.
The result is an arrangement where the creator finally gets paid what the work is worth, backers are refunded plus a bonus if it falls short, and the supporters who stood behind the creator share in the kickback when it funds.
Frequently asked questions
What is a dominant assurance contract? +
A dominant assurance contract is a crowdfunding mechanism where backers are refunded plus a bonus if the project fails to fund. Because backing is rewarded rather than penalized when a project falls short, the incentive to wait and see disappears. The mechanism was proposed by economist Alex Tabarrok.
How is it different from a regular assurance contract? +
A regular assurance contract (like Kickstarter) refunds your pledge if the goal is not met. A dominant assurance contract refunds your pledge plus a bonus if the goal is not met, which removes the incentive to wait and see whether others will pledge first.
Who pays the bonus if a project fails? +
On Pieces, people called bonders stake money up front to stand behind a Piece they believe in. If it funds, bonders earn a kickback set by the creator. If it fails, the bonders' stake is paid out to backers as the bonus.
Is Pieces a dominant assurance contract platform? +
Yes. Pieces lets creators publish content as a dominant assurance contract (DAC), where backers fund a goal, bonders stake confidence, and backers are refunded plus a share of forfeited bonds if the goal is missed.