 Of course, on many standard theories of knowledge, knowledge is not defined as justified true belief. For instance, according to some theorists, knowledge is undefeated justified true belief (Lehrer &amp; Paxson 1969); on other widely discussed accounts, knowledge is true belief that is non-accidental (Unger 1968), sensitive (Nozick 1981), safe (Sosa 1999), appropriately caused (Goldman 1967), or produced by intellectual virtue (Zagzebski 1996). This puts us in a position to appreciate what some theorists call the tertiary value problem. The tertiary value problem pertains to why knowledge is qualitatively better than any epistemic standing falling short of knowledge. Consider that if knowledge were only quantitatively better than that which falls just short—for instance, on an envisioned continuum of epistemic value—then it would be mysterious why epistemologists have given such attention to this particular point on the continuum.