A non-costly action can still credibly signal sincere belief.

Evidence

To communicate a threat, one has to communicate the commitment that goes with it, and similarly with a promise; and to communicate a commitment requires more than communication of words. One has to communicate evidence that the commitment exists; this may mean that one can communicate a threat only if he can make the other person see something with his own eyes or if he can find a device to authenticate certain allegations. — Thomas C. Schelling, The Strategy of Conflict, 342 (#qualifies, via linked claim)

Categorization

  • XREF: connects to: Costly public deeds signal genuine belief that words can fake; Credible religious commitment can be signaled by hard-to-fake involuntary displays; Credible commitment requires proof beyond mere assertion of intent. (+1 more)

Broader Connections