Allocating across countries: converting local return into comparable, risk-adjusted contribution.
Key distinctions
Three conditions before calculating.
A common economic currency
Revenues, costs and contribution are converted at a rate consistent with the decision horizon. An unfavourable currency scenario accompanies the central rate whenever a currency is exposed.
Local margin and service
VAT, prices, discounts, logistics, returns, support and commission vary by country. Gross ROAS can favour a market where each euro of revenue creates little contribution.
Sharing without uniformity
A hierarchical model improves small samples by sharing information, but local effects remain conditional on maturity, culture, competition and distribution.
Method
Making national tranches comparable without denying their context
- 01Normalise the economics
Build net price, margin, variable costs, currency, tax and contribution per country; choose a decision currency and a conversion date.
- 02Estimate the local responses
Use experiments, local or hierarchical models and suitable references, and produce a range when the history is short.
- 03Apply the risks
Test currency, demand, competition and capacity, and calculate central, prudent and marginal contribution for each tranche.
- 04Optimise under presence
Rank the risk-adjusted tranches, then apply strategic minimums, operational caps and exit costs, and revise with the local results.
The country matrix from gross ROAS to risk-adjusted contribution
France, Germany and Spain are compared after local margin, currency and demand risk, then reallocated under a minimum presence.
| Country | Gross ROAS | Risk-adjusted contribution / € | Allocation €k | Contribution €k |
|---|---|---|---|---|
| France | 2.4 | 0.84 | 300 | 252.0 |
| Germany | 2.6 | 0.79 | 200 | 158.0 |
| Spain | 2.8 | 0.706 | 100 | 70.6 |
Allocating by contribution preserves €20.1k against gross ROAS
An additional budget of €600k must leave at least €100k in each country. The risk-adjusted contributions are €0.84 per euro in France, 0.79 in Germany and 0.706 in Spain. Gross ROAS would favour Spain.
Contribution allocation: France €300k, Germany €200k, Spain €100k; result = 252 + 158 + 70.6 = €480.6k. ROAS allocation: €150k, €200k and €250k; adjusted result = 126 + 158 + 176.5 = €460.5k.
The economic matrix adds €20.1k of expected contribution while keeping the Spanish minimum. The recommendation is revisited if the currency or the local capacity moves out of range.
Acceptance conditions
What must be true to act.
- 01
Results are expressed in a common currency and contribution.
- 02
Margin, tax, service and currency are specific to each country.
- 03
Local estimates use a documented information-sharing scheme.
- 04
Strategic minimums and operational caps are explicit.
Limits
What this analysis does not prove.
- A currency scenario does not replace a financial hedging policy.
- Aggregate cultural comparisons can hide cross-border segments.
- Small countries remain sensitive to the priors of the hierarchical model.
References
Works cited.
- Sun, Y. et al. (2017), “Geo-Level Bayesian Hierarchical Media Mix Modeling”, Google Research.
- Chandukala, S. R. et al. (2011), “Bayesian Analysis of Hierarchical Effects”, Marketing Science, 30(1), 123–133.
- Solnik, B. H. (1974), “An Equilibrium Model of the International Capital Market”, Journal of Economic Theory, 8(4), 500–524.