This paper provides an in-depth analysis of the links between financial knowledge, attitude and behaviour, based on the Austrian contribution to the OECD/INFE survey on financial literacy. Our analysis gives evidence of causal effects of financial knowledge on financial behaviour, using a new instrument based on respondents' newspaper reading habits. We confirm that the selection bias is likely negative, i.e. we would underestimate the causal effect of knowledge on behaviour in a classical regression setting. Furthermore, we provide mediation analyses, showing that about 13 percent of the causal effect of knowledge on behaviour is mediated through financial attitude.