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Theorem

Fisher Separation Theorem

Game Theory

The Fisher separation theorem, in economics and corporate finance, holds that a firm's investment decisions can be separated from its owners' individual consumption preferences: regardless of shareholders' personal preferences for consumption now versus later, a firm's managers should choose the set of investments that maximizes the firm's present value, since shareholders can then borrow or lend in capital markets to reach their own preferred consumption pattern. It is named for the economist Irving Fisher, who first proposed this separation of a firm's production decisions from its owners' market decisions.

Facts
Statement
in efficient capital markets, a firm's investment decisions should be independent of shareholders' preferences 1
Proof Year
1930 1
Classification
Statement Form
Characterization Theorem 1
Connections

Has Statement Form

Entity-backed identity for the statement-form enum value this theorem already carries, resolved to a mathematics concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The statement-form fact itself stays on the theorem unchanged.

Sources
1. Fisher's Separation Theorem - SuperMoney
  • Overview section
    Fisher's Separation Theorem posits that, in efficient capital markets, a firm's investment decisions should be independent of shareholders' preferences.
  • Introduction
    Fisher's Separation Theorem, proposed by economist Irving Fisher in 1930, is a fundamental concept in finance and economics.
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