716, 719, 638 P.2d 1231 (1982). Substantial evidence exists when the evidence is in “sufficient quantum to persuade a fair-minded person of the truth of the declared premise.” Ridgeview Props., 96 Wn.2d at 719. This court reviews questions of law de novo. Mountain Park Homeowners Ass’n. v. Tydings, 125 Wn.2d 337, 341, 883 P.2d 1383 (1994). Whether a given communication constitutes defamation per se may be either a question of law or a question of fact. “The imputation of a criminal offense involving moral turpitude has been held to be clearly libelous per se.” Caruso v. Local Union No. 690 of Int’l Bhd. of Teamsters, 100 Wn.2d 343, 353, 670 P.2d 240 (1983) (citing Ward v. Painters’ Local Union No. 300, 41 Wn.2d 859, 252 P.2d 253 (1953)). In the vague areas of public confidence, injury to business, etc.
“Where the definition of what is libelous per se goes far beyond the specifics of a charge of crime, or of unchastity in a woman, into the more nebulous area of what exposes a person to hatred, contempt, ridicule or obloquy, or deprives him of public confidence or social intercourse, the matter of what constitutes libel per se becomes, in many instances, a question of fact for the jury.”
Caruso, 100 Wn.2d at 354 (quoting Purvis v. Bremer’s, Inc., 54 Wn.2d 743, 752, 344 P.2d 705 (1959). “In all but extreme cases the jury should determine whether the article was libelous per se.” Caruso, 100 Wn.2d at 354 (citing Miller v. Argus Publ’g Co., 79 Wn.2d 816, 820 n.3, 821 n.4, 490 P.2d 101 (1971); Amsbury v. Cowles Publ’g Co., 76 Wn.2d 733, 740, 458 P.2d 882 (1969)).
II. Defamation
¶16 The appellants claim that the trial court erred in dismissing their defamation claims because the September 8, 2000 and April 22, 2001 letters which Bouchand sent to vendors in France, and the September 6, 2001 letter which Coe sent to the French-American Chamber of Commerce, constitute per se defamation.
¶17 A defamation plaintiff must prove four elements: (1) falsity, (2) an unprivileged communication, (3)