 Hallie Liberto and Fred Harrington go even further than Calder in arguing that two concepts can be non-quantitatively distinct even though instantiations of the two concepts share properties (Liberto and Harrington 2016). According to Liberto and Harrington, two concepts are non-quantitatively distinct provided one of the concepts has a property which determines the degree to which that concept is instantiated that does not determine the degree to which the second concept is instantiated. For instance, Liberto and Harrington suggest that both altruistic and heroic actions have the following essential properties: (1) they are performed for the sake of others, and (2) they are performed at some cost or risk to the agent. However, the degree to which an action is altruistic is determined by the degree to which it is performed for the sake of others (and not by the degree to which it is performed at some cost or risk to the agent) while the degree to which an action is heroic is determined by the degree to which it is performed at some cost or risk to the agent (and not by the degree to which it is performed for the sake of others). They call this form of concept distinctness “quality of emphasis distinctness” (Liberto and Harrington 2016, 1595).