قارن الطرق

	Shift-Share Analysis	Input-Output Analysis	Location Quotient
المجال	الاقتصاد	الاقتصاد	الاقتصاد
العائلة	Process / pipeline	Process / pipeline	Process / pipeline
سنة النشأة	1960	1936	1960
صاحب الطريقة	Edgar S. Dunn (Daniel Creamer credited with early use)	Wassily Leontief	Developed in regional science; codified by Walter Isard
النوع	Descriptive decomposition of regional growth	Linear inter-industry accounting and impact model	Descriptive index of relative regional concentration
المصدر التأسيسي	Dunn, E. S. (1960). A statistical and analytical technique for regional analysis. Papers of the Regional Science Association, 6(1), 97–112.	Leontief, W. W. (1936). Quantitative input and output relations in the economic system of the United States. The Review of Economics and Statistics, 18(3), 105–125.	Isard, W. (1960). Methods of Regional Analysis: An Introduction to Regional Science. Cambridge, MA: MIT Press. ISBN: 9780262090032
الأسماء البديلة	Shift-Share Decomposition, SSA, Esteban-Marquillas Shift-Share, Regional Shift-Share	Leontief Model, Inter-Industry Analysis, I-O Analysis, Input-Output Model	LQ, Coefficient of Localization, Regional Specialization Ratio
ذات صلة	3	4	3
الملخص	Shift-share analysis is a descriptive technique that decomposes the change in a regional variable — most often sectoral employment — into three additive components: the part attributable to overall national growth, the part attributable to the region's industry mix, and the part attributable to the region's own competitive performance. Formalized by Edgar Dunn in 1960, it answers whether a region grew because the national economy grew, because it specializes in fast-growing industries, or because its industries outperformed (or underperformed) their national counterparts.	Input-output analysis is a quantitative framework for representing the interdependence between the industries of an economy, introduced by Wassily Leontief in 1936. It records the flows of goods and services between sectors in a transactions table, derives fixed technical coefficients describing how much each industry buys from every other industry per unit of output, and inverts the resulting linear system to trace how an exogenous change in final demand ripples through the entire production structure.	The location quotient (LQ) is a simple descriptive index that measures how concentrated an industry is in a region relative to a larger reference area, usually the nation. It is the ratio of the industry's share of local employment (or output) to its share of national employment. An LQ above one means the region is more specialized in that industry than the nation as a whole; an LQ below one means it is under-represented.