Information failure
https://www.economicsonline.co.uk/Market_failures/Information_failure.html
Information failure is another, significant, market failure and can occur in two basic situations. Firstly, information failure exists when some, or all, of the participants in an economic exchange do not have perfect knowledge. Secondly, information failure exists when one participant in an economic exchange knows more than the other, a situation referred to as the problem of asymmetric, or unbalanced, information.