The most common mistakes that businesses make when hiring a PPC agency include: Not doing their research: Businesses should do their research before hiring a PPC agency to make sure that they are hiring a reputable company with a good track record. Not setting clear goals: Businesses should set clear goals for their PPC campaign before they hire an agency. This will help the agency to develop a campaign that is tailored to their specific needs. Not communicating with the agency: It is important for businesses to communicate with their PPC agency on a regular basis to ensure that the campaign is on track and that any changes that need to be made are made promptly.