How does a portfolio bidding strategy optimize overall performance compared to individual campaign bidding?

A portfolio bidding strategy optimizes overall performance compared to individual campaign bidding by managing bids across multiple campaigns as a unified group, focusing on achieving a common goal like maximizing total conversions or return on ad spend (ROAS). Unlike individual campaign bidding where each campaign is optimized in isolation, a portfolio bidding strategy considers the interdependencies between campaigns and adjusts bids across the entire portfolio to achieve the best overall outcome. This allows for a more efficient allocation of budget and resources, as the algorithm can shift budget from underperforming campaigns to those with greater potential. For example, if one campaign is consistently exceeding its target CPA while another is struggling to meet its goals, a portfolio bidding strategy can automatically reduce bids in the high-performing campaign and increase bids in the underperforming campaign, thereby improving overall portfolio performance. This holistic approach also allows the algorithm to learn more quickly and effectively, as it can analyze data from multiple campaigns simultaneously. Portfolio bidding strategies are particularly beneficial for advertisers with large and complex advertising accounts, as they can significantly reduce the time and effort required to manage bids and optimize performance.