Input-Output Model
Updated 2026-08-17
INTRODUCTION
English translation pending.
CORE DEFINITION
Proposed by Leontief, the input-output model treats a system as a black box whose internal mechanism can be set aside; only the relation between input and output matters when using or evaluating it. Its core proposition is functional understanding: you do not always need to know why a system works, only which input delivers which output. The approach is applied at national scale through input-output tables that map how sectors exchange intermediate goods.
SCAFFOLDING EFFECT
Reduce cognitive load
- Grasp function fast: begin with what input yields what output and skip the internal detail. - Audit a system: compare input-output pairs to judge whether a process is worth keeping. - Compose systems: chain the output of one black box to the input of another.
Anchor fast decisions
Leontief wrote inter-industry flows as a matrix in which intermediate goods circulate between sectors until supply and demand balance. Solving that matrix yields total output and the chain reaction of any single sector's expansion, all without needing each firm's internal mechanics.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Input%E2%80%93output_modelverified
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