Sibanda, Mabutho.Gumede, Zamanguni Hariatah.Mzizi, Nqobani.2025-10-102025-10-1020252025https://hdl.handle.net/10413/23954Masters Degree. University of KwaZulu-Natal, Pietermaritzburg.Sin taxes have long been used as a policy tool to influence social behaviour by discouraging the consumption of products associated with negative externalities, such as tobacco, alcohol and sugar-sweetened beverages (SSBs). These taxes aim to reduce consumption, improve public health outcomes and generate government revenue. However, debates persist regarding their effectiveness, economic fairness and unintended consequences, particularly in relation to low-income populations and illicit trade markets. This study reviews the effectiveness of sin taxes in modifying social behaviour, with a particular focus on their impact on consumption patterns, health outcomes and behavioural adaptations. Utilising a systematic literature review approach, this study synthesises findings from peer-reviewed journal articles, policy reports and empirical studies to evaluate whether sin taxes successfully achieve their intended objectives. A thematic analysis was conducted to categorize findings into key themes, including the impact of sin taxes on consumption, behavioural responses, unintended consequences and overall policy effectiveness. The literature review reveals that sin taxes generally lead to consumption reductions, with studies reporting a 3-8% decline in smoking rates, a 4-6% drop in alcohol consumption and up to a 50% reduction in SSB purchases in some jurisdictions. However, the extent of their effectiveness varies based on price elasticity, enforcement mechanisms and complementary health policies. The study also highlights several unintended consequences such as the expansion of black markets, cross-border shopping and economic strain on low-income consumers. In some cases, consumers shift to cheaper or untaxed alternatives, reducing the intended health benefits of taxation. Moreover, industry resistance through lobbying, price manipulation and legal challenges often undermines the implementation of sin tax policies. Despite these challenges, the findings suggest that sin taxes can be most effective when integrated into a broader public health strategy, incorporating public education campaigns, regulatory enforcement and reinvestment of tax revenue into health programmes. This study concludes that while sin taxes play a significant role in shaping social behaviour and promoting better health outcomes, their effectiveness is maximized when complemented with strong regulatory frameworks and alternative policy measures. Future research should explore long-term behavioural effects, taxation in low-income countries and the intersection between consumer psychology and tax compliance to further refine sin tax policies for sustainable public health benefits.enCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/Sin taxes.Price elasticity.Alcohol taxation.Sugar-sweetened beverages.Illicit trade.Thesis