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Indeed , a classic contribution to this field , Coase ( 1937 ) , argues that the existence of firms as organizations or economic institutions is due to their function as a mechanism for lowering some transaction costs incurred by participating in market exchange . El Greco also designed complete altar compositions , working as architect and sculptor as well as painter , for instance at the Hospital de la Caridad , Illescas ( 1603 ) . Over his nearly 50-year career , he worked at universities and research institutes in Budapest ; London ; Chicago , U.S .; and Aberdeen , Scotland ( Rowett Research Institute ) . The Kleopatra handed to us by history was the victim of a smear campaign by her rival and mortal enemy , Octavian ( who became Caesar Augustus ) . He responds with a threefold denial : he is neither the Messiah , Elijah ( Malachi 4:5 ) , nor the prophet ( Deuteronomy 18:15 ) .