世界发展银行-Health-and-Distributional-Effects-Taxing-Sugar-Sweetened-Beverages-_-The-Case-of-Kazakhstan_5页_457kb

Summary of "Health and Distributional Effects of Taxing Sugar-Sweetened Beverages: the case of Kazakhstan"

Core Content

This document presents an analysis of the health and distributional effects of taxing sugar-sweetened beverages (SSBs) in Kazakhstan using the extended cost-benefit analysis (ECBA) methodology. The study explores how a 20% increase in SSB prices impacts household income through three channels: increased expenditure on SSBs, reduced out-of-pocket (OOP) medical costs due to lower disease incidence, and increased labor income from longer life expectancy.

Main Points

• Health Impacts of SSBs: SSB consumption is linked to a variety of non-communicable diseases (NCDs), including diabetes, obesity, cardiovascular disease, and 12 types of cancer. These diseases contribute significantly to mortality and morbidity in Kazakhstan.

• Economic Burden: The management of diseases related to SSB consumption results in substantial annual OOP expenditures, with cardiovascular disease and endocrine/metabolic diseases accounting for the majority of costs.

• Taxation as a Tool: Governments worldwide, including Kazakhstan, are increasingly using SSB taxes to reduce consumption and related health risks. The World Health Organization (WHO) identifies this as one of the most effective tools to curb obesity and NCDs.

• Distributional Effects: The ECBA model shows that the long-term net income effect of SSB taxation is progressive, meaning that lower-income households benefit relatively more than higher-income ones.

• Elasticity Scenarios: The study evaluates three scenarios for price elasticity of SSB demand:

  • Medium-bound elasticity: -0.70
  • Lower-bound elasticity: -0.90
  • Upper-bound elasticity: -0.50
    These scenarios show that while lower and medium-bound scenarios result in negative income effects, the upper-bound scenario yields positive income gains for most deciles.

• Key Findings:

  • Lower-income households spend a larger share of their income on SSBs, making them more sensitive to price changes.
  • OOP savings are higher for lower-income deciles, contributing to a progressive tax effect.
  • Increases in productive life years lead to positive income gains for all deciles, though these are relatively small.
  • In the long run, the net income effect is positive for lower-income deciles under the upper-bound elasticity scenario.

Key Information

• Data Sources: The analysis uses data from the Kazakhstan Household Budget Survey (HBS) from 2007 to 2017, as well as the Global Burden of Disease (GBD) database and National Health Accounts (NHA) of Kazakhstan.

• SSB Consumption: In 2017, higher-income households consumed more SSBs than lower-income ones, with an average of 28.7 liters per year compared to 21.9 liters.

• Out-of-Pocket Expenditures: In 2016, total OOP expenditures for diseases linked to SSB consumption were approximately US$42 million, with cardiovascular disease accounting for 49% of the total.

• Years of Life Lost (YLL): About 8.1% of total YLL in Kazakhstan are attributed to diseases related to SSB consumption, interpreted as a proxy for income forgone due to premature mortality.

• Policy Implications: Taxing SSBs can lead to significant health improvements and economic benefits, especially for low-income households. The study supports the use of SSB taxation as a tool to reduce dietary risks and align with Sustainable Development Goals (SDGs) related to NCDs.

Limitations

• The model assumes an immediate health-related income benefit (zero discount rate), which may not reflect real-world dynamics.
• The coverage of diseases and treatment costs is incomplete due to data constraints, particularly for certain cancers.
• Further research is needed to fully understand the long-term impacts of SSB taxation on consumption and health outcomes.

Conclusion

The ECBA model applied in this study highlights the progressive nature of SSB taxation in Kazakhstan, particularly in the long run. While short-term impacts may be regressive, the overall economic and health benefits, especially for lower-income households, suggest that SSB taxation can be an effective policy tool in promoting equity and public health.