The document provides an overview of the fee structure in mid-market sell-side mergers and acquisitions, detailing various fee types such as retainer fees, success fees, and additional fees associated with transactions. The fees vary based on transaction size, market conditions, and the advisor's quality, with calculations typically following methods like the Lehman formula or aligned method. Ultimately, the goal is to align the interests of investment bankers with those of shareholders while navigating the complexities of selling a business.