Commentary on Tarkiainen et al. (2016): Adding another piece to the puzzle of what explains socio-economic differences in alcohol-related mortality Despite literature on methods for reducing alcohol-related harm by socio-economic groups being scanty, high priority should be given to addressing the triad of low-income, nonemployment and substance abuse and to working towards smaller socio-economic disparities in alcohol-related harm.The importance of reducing the wide and, in many countries, still widening health disparities between socioeconomic groups is recognized widely [1], and in Finland [2] and many other European countries [3] alcohol use has been shown to play an important role in generating these inequalities. More research on the processes and mechanisms of these alcohol-related health disparities and on ways to reduce the differences has long been called for [4].Tarkiainen et al.[5] add one piece to this puzzle. They first confirm the importance and the increasing contribution of alcohol to more general health disparities among men in particular. In the most recent observation period, 43% of all deaths in the lowest income quintile of Finnish working-aged men were alcohol-related (24% in 1988-93) and 49% of the excess mortality compared with the highest income quintile was explained by these deaths (28% in 1988-93). These are dramatically large proportions.Tarkiainen et al. examine the mechanisms and causes of these differences by assessing the extent to which the (1) more general socio-economic background (education, occupational status) and (2) economic activity and nonemployment explain the observed income differences, and to what extent they seem to be the effect of the remaining (3) income per se, or low economic resources. Among women, the explanatory power of the two former has decreased, leaving an increasing share to the third. The specific factors that explain the strengthening role of low economic resources in alcohol-related problems is so far unknown, and requires further study. Despite the decreasing role of economic activity among women, it continues to explain a large part of the income differences in alcoholrelated deaths among both women and men, and also in other than alcohol-related deaths.The methods to reduce the income disparities in alcohol-related mortality have not been researched thoroughly, but two relatively recent streams of work could be raised as relevant contributions. First, there is an increasing body of work studying price policies as a means to affect health disparities, of which the recent special issue in Alcohol and Alcoholism is an example [6]. The general conclusion of this work is that both tax increases and minimum unit pricing may not only have positive impacts on the population's overall health, they are also likely to have a positive public health impact in terms of reducing socioeconomic health disparities [6].Secondly, the World Health Organization (WHO) European office has published a guide to reducing inequities in alcohol-related harm [7]. It recomm...