This study explored preschool children's knowledge and views of other children's economic situation worldwide, and their self-reported sources of such knowledge. A total of 53 final-year preschool children, aged 5-6, from 12 preschools in Sweden were interviewed. Children's responses were analysed using content analysis and the Structure of the Observed Learning Outcomes Taxonomy. Most of them seemed to have knowledge about the lives and the economic situation of other children in the world. Many of the preschool children could justify their views with one or more relevant ideas or thoughts, and a few of them were also able to logically connect their arguments. Parents, media and observations of real-life situations were reported as major sources of knowledge, while preschool was mentioned by a few. Further research is needed to enhance our knowledge about how to integrate social and economic sustainability in preschool's pedagogical activities and to engage children meaningfully in such learning.