چکیده:
onsidering the scarcity of resources especially in developing countries, it is critical to identify the key sectors of these economies. Recognitionof key sectors is one important subject for policy makers and economic planners. In determining key sectors both in theory and in practice several different methods are proposed in the literature. One of the most novel andrecent approaches is based on network theory, under which different weights, known as influence indices, are assigned to both intermediate and final demand of sectors. In order to pinpoint those sectors with strong linkages in a contributing to the economy, network theory proposes adefinition of centrality measures including total effects, meditative effects and immediate effects which considered as multilevel indicators. as. Thepurpose of this study is to determine the key sectors of Iran, South Korea and Turkey and compare the results using Iran’s 1999 input-output table,South Korea’s 2005 input-output table and Turkey's 2002 input-output table. The results show that considering the role of final demand for someeconomic activities are really important in identifying key sectors of Iran, Turkey and Korea although it is less important in some sectors of Turkey and South Korea
خلاصه ماشینی:
In order to pinpoint those sectors with strong linkages in a contributing to the economy, network theory proposes adefinition of centrality measures including total effects, meditative effects and immediate effects which considered as multilevel indicators.
: Network Theory, Input-Output Analysis, Key Sectors, Iran,Turkey, South Korea 1- Introduction Economic theories as well as the experiences of different countries show that there are several ways that an economy can grow.
Barbara Diaz, Laura Moniche & Antonio Morillas (2006) try to identify key sectors of Spanish economy using Fuzzy cluster techniques in combination with IO model.
In the Leontief model, Rasmussen (1956) classified coefficients using the sum of the normalized columns of the inverse Leontief matrix to measure backward linkages of the sectors in the economy but total effect index uses the sum of the columns of the revised inverse Leontief matrix V= (I-α/)-1 (1-α).
/ Figure 2: Total Effects of Turkey Figure (3) represents the results for South Korea’s economy as: other Manufacring, Textiles, textile products, leather and footwear, Wood and products of wood and cork, pulp, paper products, printing and publishing,Food products,beverages and tobacco,Non-metallic mineral products and communication are sectors with high total effects.
According to the results from calculating mediative effect index for Iran economy, sectors with mediative effects above the mean are: Construction ,Distrbution Water,Gas and Electricity,Other Manufacturing,Non-metallic mineral products,Wholesale & retail trade; repairs and Hotels & restaurants,communication,Basic metal products ,Pulp,paper products, printing and publishing,Wood and products of wood and cork and Mining and quarrying.