Defining Minimum Spend Thresholds for Marketing Effectiveness – Case study

The Brief

This client engaged TrinityP3 to determine whether minimum investment thresholds should be established for their marketing allocations to ensure campaigns deliver a meaningful impact.

With finite budgets distributed across a diverse portfolio and increasing pressure for accountability, the core question was: are smaller, fragmented marketing investments diluting effectiveness, and should funding be consolidated to achieve stronger outcomes?

Client Strategic Requirement

The client required a framework to guide marketing investment decisions across a spectrum of small and large product categories. Specifically, they needed to:

• Determine viability: Identify whether a “minimum effective spend” level exists to trigger significant consumer behavioural change.
• Balance equity and ROI: Find a middle ground between supporting all business units and maximising the total Return on Investment (ROI).
• Improve operational efficiency: Avoid the inefficient allocation of funds to campaigns unlikely to achieve cut-through, which often require disproportionate internal management effort.
• Provide defensible guidance: Offer data-backed recommendations to stakeholders, including industry bodies and boards.
• Maintain strategic flexibility: Introduce discipline into funding decisions without excluding smaller, emerging segments.

A key tension was ensuring smaller business areas were not excluded, while still prioritising impact.

The Solution

TrinityP3 developed a multi-layered analytical and strategic approach to move the client from subjective spending to objective, performance-based allocation:

1.  Marketing effectiveness benchmarking

• Reviewed internal campaign performance data alongside external industry benchmarks identifying the lack of consistent measures of success to enable data driven comparisons.
• Identified challenges with measuring impact for smaller investment levels.
• Identified correlations between media spend, audience reach, and specific behavioural outcomes.
• Established indicative spend ranges required to achieve visibility in a cluttered media environment.

2. Threshold modelling framework Developed a model linking key variables to determine scenario-based minimum spend thresholds for investment:

• Audience size: The scale of the target demographic.
• Media dynamics: Current CPMs and reach-frequency curves.
• Market context: Category maturity and competitive noise.
• Objectives: Differentiating between top-of-funnel awareness and bottom-of-funnel conversion.

3. Portfolio segmentation approach. Categorised business units into tiers (e.g. Emerging, Growth, and Established) with differentiated investment strategies:

• Below-threshold funds: Redirected toward pooled models, co-investment opportunities, or high-efficiency digital channels.
• Above-threshold funds: Deployed in full-scale, integrated marketing campaigns.

4. Strategic alternatives for sub-scale budgets. Rather than simply cutting funding for smaller categories, alternative pathways were defined:

• Aggregation: Create clustered and collaborative product campaigns across complementary business categories for bigger impact.
• Pooling for greater opportunity: Pool budgets for stronger channel negotiation and bigger opportunity.
• Precision targeting: Utilise lower-cost, high-precision channels like trade marketing or hyper-targeted social media.

Outcomes & Recommendations

Key Findings. The analysis confirmed that sub-scale budgets risk generating “invisible” marketing and negligible behaviour change. Which reduces the overall portfolio ROI. However, TrinityP3 also noted that rigid, universal thresholds could unintentionally disadvantage niche or emerging sectors.

Final Recommendations:

1. Adopt flexible minimum spend guidelines: Introduce thresholds as strategic guardrails rather than hard rules, allowing for adjustments based on specific campaign goals.
2. Prioritise impact over distribution: Shift from a culture of “equal distribution” to one of “effectiveness-driven” allocation.
3. Introduce portfolio-level management: Manage marketing funds as a collective portfolio to leverage scale and shared insights.
4. Enable growth pathways: Support smaller segments through aggregation and alternative tactical models when individual thresholds cannot be met.
5. Develop a unified measure: Align to the overall strategic direction a key measure that communicates real value and that is PR’able in terms of advertising’ contribution to success.
6. Embed continuous optimisation: Track ROI against original threshold assumptions to refine benchmarks with real-world performance data over time.

Closing Insight

For the client, establishing minimum spend thresholds is less about setting hard limits and more about driving disciplined, impact-oriented investment decisions. The result is a balance between operational efficiency and strategic growth across a highly diverse marketing portfolio.

Co Authored by Dr Kate Gunby, Anton Buchner & Kylie Ridler-Dutton