Spend Headroom

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Overview

Spend Headroom answers a practical planning question:

How much more or less can this channel handle before performance crosses our target?

It turns modeled response curves into plain-English guidance such as:

• Add up to
• Hold steady
• Cut back

This makes a mathematically complex idea easier to use in day-to-day media planning.

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What it shows

For each channel, Spend Headroom can show:

• Current spend
• Recommended action
• Target CPA or ROAS
• Stoplight signal
• Confidence indicator
• Expandable curve view

The report is intentionally channel-by-channel. It does not solve the full allocation problem across every channel at once.

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What the recommendation means

Spend Headroom is based on the channel’s marginal response curve. In plain English, it asks:

What is the next dollar likely to do in this channel, and does that still meet our target?

The recommendation is anchored to the point where the channel’s marginal performance crosses the target you are using, such as:

• a CPA target
• a ROAS target

If the next dollars still look attractive against that target, the channel may show room to grow. If the next dollars look weak, the report may suggest holding or cutting back.

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Marginal response curve view

Each row can be expanded to show the channel’s marginal response curve. This lets you see how projected efficiency changes as spend increases and where that curve crosses the target line you are using. This view is useful when you want to understand not just the recommendation, but the reasoning behind it.

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How to read the stoplight

• Green means the channel appears to have room to spend more.
• Yellow means the channel is near the target.
• Red means the next dollar may be past the target.

Think of the stoplight as the action signal.

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How to use it

Use Spend Headroom when you want a per-channel read on whether spend can scale. This is not the same as the full budget optimizer.

• Spend Headroom looks at each channel individually
• Budget Recommendations look across channels within the full budget
• Scenario Planner helps you test reallocation choices across channels

Spend Headroom is best when the question is:

Can this specific channel handle more spend without falling below our standard?

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Target ROAS or CPA behavior

Spend Headroom uses a saved target for the selected KPI. Your CSR can set the target ROAS or CPA used by the report. If no target has been saved, the report automatically loads a default based on your recent performance over the last 30 days. That gives teams a practical starting point while still allowing a formal target to be set when needed.

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How to use the confidence signal

Not every recommendation should be treated equally. Confidence helps indicate how far the recommendation is from the range where the model has the strongest evidence. As a practical rule:

• stronger confidence means the recommendation is closer to observed or simulated ranges
• lower confidence means the math projects an answer, but the evidence is weaker at that scale

That is especially important when a recommendation implies a large increase.

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Important interpretation note

A recommendation with low confidence should be treated cautiously. It may be mathematically possible, but outside the spend range where the model has stronger evidence. Also remember:

• Spend Headroom is a per-channel view
• it does not tell you where the money should come from
• it does not replace broader cross-channel planning

Use it together with Budget Recommendations and Scenario Planner when you are deciding both whether a channel can scale and how the total budget should move.

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Important planning note

Spend Headroom is meant to answer a channel-by-channel planning question. It helps you understand:

• where a channel may still have room to scale
• where it is roughly at equilibrium
• where additional spend may push performance below your target

Use it alongside Budget Recommendations when you want both a per-channel threshold view and a broader cross-channel budget decision.