Ideally, marketers would be able to give machine-learning-enabled ad delivery systems free rein to achieve maximum liquidity—the condition in which every dollar can flow to the most valuable impression. However, in the real world, advertisers must often navigate complexities such as unclear data, nuanced goals and intricate business logistics. This necessitates exerting some level of control, which poses a challenge since adding constraints can limit efficiency.


CONTENTS

In the two preceding white papers in this series—Understanding Liquidity and Liquidity in Action—we introduced machine learning systems for advertising, defined liquidity and examined how liquidity can drive advertiser value. Here we explore how advertisers can effectively balance liquidity and control by applying thoughtful constraints in ways that direct the systems as needed while maximizing the benefits of machine learning.

In order to achieve the right balance, it helps to understand the trade-offs involved between liquidity and control the ways in which products work together to create a spectrum of liquidity and how to determine what level of control is necessary.

Below, we provide an overview of these key topics. In our comprehensive new report, Navigating Liquidity in a Complex World, we cover each in depth and also explore the nuances of liquidity products at Facebook and what testing reveals about balancing liquidity and control on our platforms.

The trade-offs involved between liquidity and control

A campaign is more liquid when it has fewer constraints. That’s because limiting restrictions means the delivery system is able to select the best opportunities to serve ads from a broader pool, potentially turning up valuable opportunities that would otherwise have been excluded.

When you have clear goals and signals—pieces of consumer behavioral data—it’s easy to tell the system what you want and to set it free to find the optimal approach. But if your goals and signals are more opaque, you need to put in some guardrails to guide the system and make sure it doesn’t go too far off track.

While adding these constraints delivers more control, the trade-off is less liquidity. That can result in higher costs and lower efficiency, since reducing the pool of opportunities limits the system’s ability to find the most valuable ones.


How products can work together to empower advertisers

Adding control does not trigger a complete loss of liquidity. Rather, there is a spectrum of liquidity, and liquidity products can empower advertisers to achieve the level of control needed while still maintaining efficiency.

Specifically, different products can work together to allow advertisers to gain control across the four main dimensions of liquidity: placement, audience, budget and creative.

By thoughtfully adding constraints in these four areas, it’s possible to give machine learning systems more information about what you value and to help the algorithms understand how to better weigh different opportunities.

When thinking about implementing constraints, it’s important to note that the dimensions of liquidity are interdependent. Putting a constraint on one dimension will limit the opportunities available to the system overall, even if the other dimensions are fully liquid.


How to know if you need more control

How can you determine whether you should exert more control on ad delivery systems? Some common reasons for needing to deploy constraints include:

You may value opportunities within the same campaign differently—for example, Instagram users versus Facebook users—and not want the system to treat them equally.

You may be using the same channel for different strategies—for example, prospecting and retargeting—and want to communicate different cost goals to the system.

You may have data from sources the ad system can’t access—for example, from offline channels—and want to express this information to help evaluate opportunities.

You may have business restrictions—for example, brand safety requirements or regional budget allocations—and want the system to account for these complexities.

You may want to hone your campaign goals over time—for example, you may be willing to increase your target spend to get more volume—and want the system to be flexible.

You may have multifaceted goals—for example, wanting to drive page engagement while also needing to keep costs down—and need to express these to the system.

The benefits of less control

While it can be tempting to be heavy-handed, the key is to gain the control you need in the lightest touch way possible, since implementing fewer constraints gives the system more freedom to find valuable opportunities.


Moreover, the different dimensions of liquidity—placement, audience, budget and creative—are interdependent, so carefully placing constraints on one to two areas can often deliver the desired amount of control.

Ultimately, when seeking to navigate liquidity in a complex world, the goal should be to add only the constraints absolutely necessary in order to provide machine learning systems maximum leeway to deliver liquidity.


What it means for marketers


There is a trade-off between liquidity and control:

When seeking control, keep in mind that adding restrictions can limit the pool of opportunities and constrain machine-learning-enabled ad delivery systems.


Find the right spot on the spectrum with liquidity products:

Different products can work together to give you the level of control you need across the four main dimensions of liquidity: placement, audience, budget and creative.


Have a light touch when implementing constraints:

The different dimensions of liquidity are interdependent; placing constraints on one or two areas can often deliver the desired amount of control while maintaining efficiency.


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