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This study explores how reciprocation of trust in a $10 Trust game is affected by the group membership of the partner in comparison to dispositional variables, such as individualism and opportunism. An experimental investigation in Greece ( N = 154), using a game situation along with scales measuring economic opportunism and individualism, indicated that (a) when the status of partner is known (strong situation), absence of reciprocation of trust is not associated with dispositional variables, but depends only on the group membership of partner, but (b) when the status of partner is unknown (weak situation), the dispositional variables predict quite strongly a preference for defecting behaviour. The study highlights the role of the ingoup versus outgroup status of partner in fostering cooperative choices and shows that shared group membership corresponds to a strong situation prevailing over personality-driven variables.