Purpose: This paper analyses the foundations of trust in a context of bounded rationality to reach the conclusion that non-calculative trust is meaningful essentially because of bounded rationality, specifying what aspects of bounded rationality are relevant for this to happen. Design/methodology: Building on previous theoretical work we conceptually develop the reasoning involved to arrive deductively that bounded rationality provides a rationale for the concept of trust that goes beyond a calculative notion. Findings: We show that there are four reasons for trust to exist and that people assess probabilities to each in order to determine whether to trust a recipient, depending on each of the four. We also add to previous work and show how...