One nonabsurd way to resolve the commitment problem is genetically. One who blushes when lying may be able to establish credibility easily without any willful commitment or manufactured disposition. One who does not blush when lying may have to create a reputation for honesty that is worth more than any gain he or she might make from cheating on that reputation.

DEFINE: Explains how a physiological trait (blushing when lying) functions as a genuine commitment mechanism, contrasted with manufactured reputation-building.

Russell Hardin, Trust and Trustworthiness, loc. 617