A standby purchase agreement is a type of contract that is widely used in capital markets and corporate finance. It provides a form of security to an issuer of securities such as bonds or stocks, by guaranteeing that the issuer will sell the securities at a later date to the purchaser of the agreement.

The purpose of the standby purchase agreement is to provide a safety net in case the issuer is unable to sell the securities to the market at an acceptable price. The purchaser of the agreement agrees to buy the securities if the issuer is unable to find other buyers. The agreement is typically executed by an investment bank or a financial institution on behalf of the purchaser.

Standby purchase agreements are a popular form of risk management in the corporate finance world. They allow companies to issue securities with a lower risk profile, as the agreement provides a guarantee that the securities will be sold. This can result in a lower cost of capital for the issuer.

However, standby purchase agreements are not without their drawbacks. They can add complexity to the securities issuance process, which can lead to increased costs and administrative burden. Additionally, they can limit the flexibility of the issuer to negotiate on price and terms with potential buyers of the securities.

In summary, a standby purchase agreement is a contract that provides a form of security to an issuer of securities by guaranteeing that the securities will be sold to the purchaser of the agreement if other buyers are not found. While they can be a valuable risk management tool, they also come with trade-offs in terms of complexity and flexibility.