[116] In Austrian models of the market process the entrepreneur, usually considered as an individual, initiates change in the market by identifying and introducing new trading opportunities. .... Possible opportunities are arbitrage between agents who are unaware of each other, improved versions of established commodities or new concepts for products or services. Change depends on the drive and ability of entrepreneurs to discover and to exploit opportunities which are unknown to other agents until they are initiated by the entrepreneur. ... In Kirzner's theory, entrepreneurs discover changing opportunities, that arise, independently of the entrepreneurs, in an objective world.