Marketing budget allocation is one of the highest-impact marketing decisions. Misallocation typically wastes 30-50% of marketing spend. The discipline involves channel-level ROAS measurement, CAC tracking, attribution analysis, and marketing-mix modeling. This framework provides the structure for evaluating allocation decisions.
The structure
The allocation framework has five steps: (1) Map current allocation by channel. (2) Measure ROAS and CAC by channel. (3) Apply attribution model (multi-touch or data-driven). (4) Identify under-performing and over-performing channels. (5) Reallocate based on marginal ROAS — invest until next dollar yields less than next dollar of gross profit.
Step-by-step walkthrough
- Document current allocation by channel
- Track ROAS, CAC, attributed conversions per channel
- Apply consistent attribution model
- Identify channels with high ROAS and capacity to absorb more spend
- Identify channels with declining ROAS
- Reallocate based on marginal ROAS
- Test reallocation impact in measurable increments
- Monitor for diminishing returns
- Quarterly reallocation review
Pitfalls when using this hub
- Allocation by historical spend rather than ROAS
- Last-touch attribution overstating closing channels
- Optimizing only for short-term conversion
- Ignoring brand-building (long-term effects)
- No measurement infrastructure
How to use this hub
Use this hub for budget-planning assignments or for evaluating marketing spend in case analyses. The marginal-ROAS principle is the foundation of efficient allocation. Pair with attribution and ROMI concept guides.