Boeing Airplane Co. contracted with Pittsburgh–Des Moines Steel Co. for the latter to construct a supersonic wind tunnel. R.H. Freitag Manufacturing Co. sold materials to York-Gillespie Co., which subcontracted to do part of the work. To persuade Freitag to keep supplying materials on credit, Boeing and the principal contractor both assured Freitag that he would be paid. When Freitag was not paid by the subcontractor, he sued Boeing and the contractor. They defended on the ground that the assurances given Freitag were not written. Decide. What ethical values are involved? [R.H. Freitag Mfg. Co. v Boeing Airplane Co., 347 P2d 1074 (Wash)]