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Public HealthPrice signalPositive

Mexico Sugar-Sweetened Beverage Tax

Mexican Ministry of Finance / Mexican Institute of Public Health (INSP) / University of North Carolina evaluation · Mexico (national) · 2014

Summary

The Mexican sugar tax is one of the most-studied public-health price-signal interventions in the world and a defining example of national-scale evidence-based health policy. Mexico had the highest per-capita soda consumption globally before the tax (>160 liters/person/year) and one of the highest obesity prevalences in Latin America. The tax was small (~10%) by international standards but explicitly designed to be politically achievable; its effect on consumption — particularly among lower-income households — was larger than skeptics predicted. The evidence has informed similar policies in dozens of jurisdictions and has settled some debates (yes, behavioral consumption shifts occur at modest price increases) while leaving others open (whether modest consumption shifts produce population-level obesity/diabetes reductions in the long run remains uncertain). The Mexican design has been emulated, criticized, and refined, but its place in the global evidence base on health-related price interventions is now central.

Research question

"Does a 10% excise tax on sugar-sweetened beverages reduce consumption, particularly among lower-income households where consumption and diabetes burden are highest? Does the tax produce intended downstream public-health effects?"

Methodology

Intervention

Mexico implemented a 1 peso per liter (~10%) excise tax on sugar-sweetened beverages (sodas, juices with added sugar, and similar drinks) on January 1, 2014. The tax was passed as part of broader obesity-prevention legislation that also included an 8% tax on high-calorie non-essential foods. Implementation was nationwide and applied to all manufacturers and importers.

Assignment

Quasi-experimental — interrupted time series and difference-in-differences analysis comparing per-capita beverage purchases before and after January 2014, with comparisons across socioeconomic strata and to untaxed beverage categories

Sample size

Household consumer-panel data from 6,253 Mexican households tracked over 24 months pre-tax and 24+ months post-tax; complementary store-scanner data and aggregate beverage production statistics

Primary outcome

Per-capita purchases of sugar-sweetened beverages (liters/person/month); secondarily, purchases of untaxed beverages (water, plain milk), household-level changes by income quartile

Effect estimate

SSB purchases declined by 5.5% in the first year and 9.7% in the second year vs. pre-tax trend; effect was largest among lowest-income households (~17% reduction). Water purchases increased by 2-4%. Industry data showed beverage manufacturers reformulated some products to reduce sugar content and avoid the tax threshold. Caloric reduction estimates suggest 6-7 fewer kcal/person/day.

Decision

The Mexican sugar tax is now a recognized template for international SSB taxation. The UK Soft Drinks Industry Levy (2018), Philadelphia Soda Tax (2017), Berkeley Soda Tax (2014), South Africa Health Promotion Levy (2018), and many others have drawn on the Mexican design. Long-term obesity and diabetes effects remain debated — caloric reductions have been measurable but small in magnitude — but the consumption-shift effects have been consistently confirmed across replications.

Result

Positive

SSB purchases declined by 5.5% in the first year and 9.7% in the second year vs. pre-tax trend; effect was largest among lowest-income households (~17% reduction). Water purchases increased by 2-4%. Industry data showed beverage manufacturers reformulated some products to reduce sugar content and avoid the tax threshold. Caloric reduction estimates suggest 6-7 fewer kcal/person/day.

Evidence strength

Moderate

Quasi-experimental design with replication support.

Replication status

Replicated

Institution

Mexican Ministry of Finance / Mexican Institute of Public Health (INSP) / University of North Carolina evaluation

Location

Mexico (national)

Year

2014

Policy area

Public Health

Mechanism

Price signal

Other trials of this mechanism

Cite this entry

Mexican Ministry of Finance / Mexican Institute of Public Health (INSP) / University of North Carolina evaluation. (2014). Mexico Sugar-Sweetened Beverage Tax. The Experiment Society Registry. Retrieved from https://www.experimentsociety.org/registry/mexico-sugar-tax (primary report: https://www.bmj.com/content/352/bmj.h6704)

Citation network

Cited by 2 other entries in the registry

Cross-references

Adjacent experiments — same domain, parallel pilots, or alternative mechanisms.

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