. . . . . . . . . . . . . . "A.R.S. ?? 42-1301 defines person or company to include an individual, firm, partnership, joint venture, association, corporation, estate or trust, this state, a county, city, town, district other than a school district, or other political subdivision and any other group or combination acting as a unit, and the plural as well as the singular number." . . . . . .