Policy recommendations, which aim to reduce health inequalities in society, often focus upon improving the incomes, working conditions and physical environments of the most deprived groups. We agree with these recommendations but argue that they are insufficient to reduce health inequalities because they fail to address the economic relationships between social groups that lead to health inequalities and which perpetuate them over time. A comprehensive programme to reduce health inequalities will require policies that address the numerous ways in which economic resources flow from poorer groups to richer groups through the design of the economy. In this commentary we describe key economic relationships between social groups that lead to inequalities, namely rent, interest, capital gains, profit, monopoly and speculation. Addressing these causes of economic inequality in recommendations to reduce health inequalities should be considered by future research in this area.