What Is a Refund Bonus in Crowdfunding?
A refund bonus is the extra payment backers receive, on top of their full refund, when a campaign misses its funding goal; it turns backing into the rational choice no matter the outcome.
A refund bonus is the extra payment backers receive when a crowdfunding campaign misses its goal: their full pledge back, plus something for having shown up. It is a small rule with outsized consequences, and it is the piece that separates ordinary crowdfunding from a dominant assurance contract.
The idea in one sentence
Ordinary crowdfunding refunds a failed campaign’s backers and calls it even. A refund bonus says backing a project that fails should leave you slightly better off than never backing at all.
Where the idea comes from
Economist Alex Tabarrok proposed the refund bonus in 1998 as the key ingredient of the dominant assurance contract, a mechanism designed to fix the free-rider problem in funding public goods. The logic is game-theoretic: once failure pays a bonus, there is no belief you can hold about a campaign’s chances that makes waiting better than backing. Backing becomes a dominant strategy.
The idea has since been tested. Laboratory and field experiments on refund bonuses in crowdfunding have found they can raise campaign success rates by 50% or more, and that the bonuses can be self-sustaining because so many more campaigns succeed, meaning fewer bonuses are ever paid out.
Who pays for it
This is the question everyone asks, and the answer defines the platform. A refund bonus paid by the creator punishes the person the campaign exists to help. A bonus paid by the platform is a subsidy that cannot scale.
Pieces uses a third answer: bonders. A bonder stakes money behind a creator they believe in, before the outcome is known. If the Piece funds, the bonder gets their stake back plus a kickback the creator set. If it fails, the stake is forfeited and distributed to backers as the refund bonus. The bonus is underwritten by the people most confident it will never need to be paid.
What it feels like in practice
For a backer, the refund bonus turns a pledge from a bet into something closer to a two-sided position. Fund the Piece and you unlock the content. Watch it fall short and you are made more than whole. Either way, showing up early was the right call, which is precisely the behavior a campaign needs to build momentum.
See the mechanism end to end in how Pieces works, or the theory in what is a dominant assurance contract.
Frequently asked questions
What is a refund bonus? +
A refund bonus is an extra payment made to backers when a crowdfunding campaign fails to reach its goal, on top of refunding their full pledge. It is the defining feature of a dominant assurance contract.
Why do refund bonuses work? +
They remove the reason to wait. In ordinary crowdfunding, the smart move is to see whether a campaign will succeed before pledging. With a refund bonus, backing pays off either way: you get the project if it funds, or a bonus if it does not. Experiments have found refund bonuses can raise success rates by 50% or more.
Who pays the refund bonus on Pieces? +
Bonders. They stake money behind a creator before the outcome is known. If the Piece funds, they earn a kickback set by the creator. If it fails, their forfeited stakes are distributed to backers as the refund bonus. The platform never funds the bonus.
Is a refund bonus sustainable for creators? +
On Pieces, a failed campaign costs the creator nothing extra. The bonus is paid from bonder stakes, not the creator. Research on refund bonuses has found that, even accounting for failed campaigns, they can be financially self-sustaining because they raise the success rate.