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In recent years, some researchers have used the concept of "Borrowed size" as a justification for the efficiency of small and medium-sized cities in Poly-centric urban regions. They believe that smaller cities located near or within an integrated functional urban area can take advantage of the population, facilities, and amenities of larger cities while avoiding the agglomeration costs of larger cities such as traffic, high housing prices, and congestion. In this regard, the present article tries to use this concept, in addition to explaining the growth of the furniture industry in the city of Bahnamir, to open the way for its application in urban and regional policies. For this purpose, the applicability of this concept in Bahnamir was measured in four phases: first, specialization and concentration using locational coefficient and firm density, second, a geographical overlap of demand market by connectivity field index, third measurement polycentricity using Green indicator and entropy of daily travel flow data, and finally, the balance between agglomeration economies and diseconomies using Correspondence analysis. Findings show that the city has been able to access the market demand of larger and coastal cities, lower production costs due to cheap land prices, land ownership and cheaper labor, and increasing returns become into a specialized furniture market that achieves better performance than larger cities by increasing competition, lowering prices, diversity and competition. In this regard, it is suggested that this concept could be used as support to reconsider the development role of small and medium-sized cities.

Cities are considered as the bed for innovation and a place for driving creative energy of human being and also play an effective role in human capital concentration and management. Creativity in two areas of industry and creative class need an appropriate and desirable background for flourishing. Hence most experts believe that polycentric-network structures due to their own specific spatial structure have more advantages and priority in attracting such industries and creative classes. So this article, by descriptive-analytical method examines the effective components and aspects in attracting creative industries in the metropolitan area of central Mazandarn which includes four main and large cities of the province as Sari, Ghaemshahr, Babol and Amol. In total, 14 indicators in five approaches of historical and cultural heritage, Agglomeration advantages, dependentdiversity , human capital and creative class have been tested .density of ccultural and historical heritage, company size, share of professionals out of total employment, Reverse Herfindahl index, population as the potential market size, dependentdiversity index,-Hal Sysuh index, entropy index, the accumulation of educated people, index, share of educated people from job applicants, the share of immigrants of other provinces form the indices of this study.the results showed that this metropolitan area lacks an efficient and desirable diversity and demand threshold; the reason of this can be attributed to the fragmented nature of the region and lack of a well-connected metropolitan structure. Also optimum concentration of economic activities of creative jobs has not been able to incorporate the relevant activities together to produce products with better quality. In contrast this area provides a suitable environment for attracting creative classes which some issues such as concentration of cultural and historical facilities of cities, cultural acceptance of other ethnic groups and high capacity for absorbing new technologies approves this matter.