Adolescents have increasing discretionary income, expenditures, and purchasing power. Inventory shrinkage costs $123.4 billion globally to retail outlets. Adolescents are disproportionately responsible for theft and shoplifting. Both parents and peers significantly influence adolescents’ monetary values, materialism, and dishonesty as consumers. In this study, we develop a theoretical model involving teenagers’ social attachment and their consumer ethics, treat adolescents’ money attitude in the context of youth materialism as a mediator, and simultaneously examine the direct and indirect paths. Results of 1018 adolescents (...) illustrate that social attachment discourages unethical beliefs directly, but encourages it indirectly through monetary values. Our multi-group analyses demonstrate a novel paradox: The correlation between parental and peer attachments is smaller in France than in China, but similar across gender. Parents contribute more than peers to social attachment in France, but both carry equal weight in China. There is a negative direct path for the Chinese sample and for girls. Indirectly, parental attachment prevents French teenagers’ unethical beliefs, whereas peer attachment promotes boys’ unethical intention, supporting the notion—bad company corrupts good morals. Across both culture and gender, monetary attitude excites dishonesty consistently for all adolescents. A negative direct path exists for Chinese boys only. Overall, social attachment reduces unethical beliefs. Parental and peer supports shape teenagers’ monetary intelligence and ethical or unethical decision making, differently, across culture and gender. We provide theoretical, empirical, and practical implications to ethical parenting, peer attachment, monetary values, and business ethics. (shrink)