Abstract
In the literatures of location and firm behaviour, most of the papers deal with location and theory of firms in conjunction with a heterogeneous space where markets are given at discrete points. Also, most of writers of the papers considered the optimum location problem only for an unregulated firm and industry. On the other hand, there are many regulated firms and industries in real economies. Also, we can consider a location problem of an industrial city (industry complex) which means a big company town. Many comparisons after combining some effects such as agglomeration (scale economies/diseconomies), etc. were implemented. We analysed the optimum location of industrial city (big company town) and input usage under regulatory constraint and agglomeration. We introduced an active constraint of a fair rate of return from the pioneering work of Averch and Johnson to the location problem of the big firm with multi inputs. With multi-inputs, simple one dimension locational problems are solved.