In terms of Pinterest's bidding strategies, what are the key trade-offs between using 'automatic bidding' versus 'target CPA' when scaling an advertising campaign?

When scaling a Pinterest advertising campaign, the key trade-offs between 'automatic bidding' and 'target CPA' involve control versus efficiency. Automatic bidding simplifies campaign management, allowing Pinterest's algorithm to automatically adjust bids to maximize conversions within your budget. This is efficient for scaling because it requires less manual monitoring and optimization. However, it offers limited control over the specific cost per conversion, as the algorithm may fluctuate to find the optimal balance between cost and volume. Target CPA (Cost Per Acquisition) bidding gives you more control by setting a specific target cost for each conversion. Pinterest's algorithm will then attempt to achieve this target CPA. While this allows for greater predictability in your spending, it can limit the scale of your campaign. The algorithm may be more conservative in its bidding to maintain the target CPA, potentially missing out on conversion opportunities. Scaling with Target CPA also requires sufficient conversion data for the algorithm to learn and optimize effectively. Therefore, automatic bidding is better suited for rapid scaling with less manual input, while Target CPA is preferable when maintaining a specific cost per conversion is paramount, even if it means potentially slower scaling.