手法を比較

	Ghosh Supply-Driven Model	Input-Output Analysis
分野	経済学	経済学
系統	Process / pipeline	Process / pipeline
提唱年	1958	1936
提唱者	Ambica Ghosh	Wassily Leontief
種類	Supply-driven linear inter-industry model using allocation coefficients	Linear inter-industry accounting and impact model
原典	Ghosh, A. (1958). Input-output approach in an allocation system. Economica, 25(97), 58–64.	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.
別名	Ghosh Model, Supply-Side Input-Output Model, Allocation Coefficient Model, Output-Side I-O Model	Leontief Model, Inter-Industry Analysis, I-O Analysis, Input-Output Model
関連	4	4
概要	The Ghosh model is the supply-side counterpart to the Leontief demand-driven input-output system, introduced by Ambica Ghosh in 1958. Rather than fixing the recipe of inputs per unit of output, it fixes allocation coefficients — the share of each sector's output sold to every downstream buyer — and asks how a change in the supply of primary inputs (value added) propagates forward to total output. Solving x' = x'B + w' gives x' = w'(I − B)^{-1}, where the Ghosh inverse G = (I − B)^{-1} plays the forward-looking role that the Leontief inverse plays for demand.	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.