Boeing Airplane Co. contracted with Pittsburgh-Des Moines Steel Co. for the latter to construct a super- sonic wind tunnel. R.H. Freitag Manufacturing Co. sold materials to York-Gillespie Co., which subcon- tracted 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? [