We tested whether children's and adults' resource levels predicted their beliefs about resources (Study 1) and whether those beliefs shaped their willingness to share their resources with others (Study 2). In Study 1, we found that among adults (n = 230, 59.1% female, 72.6% White) and young children (n = 109, 4-6 years old, 56% female, 33% White), increased resource level predicted increases in the belief that others have lots of resources. In Study 2, we found that adults (n = 495, 52.5% female, 69.1% White) and young children (n = 154, 4-5 years old, 52.6% female, 36.4% White) randomly assigned to believe that others have lots of resources were less likely to share their own resources with others. Implications for reducing economic inequality are discussed.(c) 2023 Elsevier Inc. All rights reserved.