This mechanism allows for a fair initial price discovery by the community. Participants will individually choose at which token price point and how many tokens they are willing to buy and commit their funds. However, the final price per token will be determined at the end of the auction. This means that all participants who have committed their funds will pay the exact same price per token. In other words, although you might have committed at a certain price point, all auction contributors will get the same minimally agreed price.