The Economic Principles
~12 min read · Apply substitution, anticipation, contribution and conformity — the why behind every approach.
A dozen economic principles are the theory layer of the appraiser exam — substitution, anticipation, contribution, and their supporting cast. Each valuation approach is one principle wearing work clothes; the exam asks which principle explains which observation.
The big three
Substitution: a rational buyer pays no more than the cost of an equally desirable alternative — the ceiling logic beneath the sales comparison approach (and cost approach: build-vs-buy). Anticipation: value is the present worth of EXPECTED future benefits — the entire premise of the income approach (and why news about the future moves prices today). Contribution: a component is worth what it ADDS to total value, not what it cost — the law of adjustments and the over-improvement warning.
- Substitution caps price at the alternative — sales comparison's engine
- Anticipation prices the future today — income approach's engine
- Contribution prices features by added value — the adjustment rule
The balance family
Balance: value maximizes when the four agents of production (land, labor, capital, entrepreneurship) are in proportion — internally (improvements sized to land) and externally (complementary land uses). Increasing and decreasing returns: successive investment adds value at rising then falling rates; stop where marginal contribution falls below marginal cost. Surplus productivity: income remaining after labor, capital, and management are paid belongs to the LAND — the residual logic behind land-valuation techniques. Conformity with its edges progression (lesser property lifted by better neighbors) and regression (greater property dragged by lesser).
- Balance among the four agents of production
- Diminishing returns cap the improvement spiral
- Surplus productivity → land residual thinking
- Conformity, progression, regression: the neighborhood pull
The market-force set
Supply and demand frames price pressure; competition erodes excess profits by attracting rivals; change keeps every value opinion date-stamped; externalities transmit outside influences — positive (the new park) and negative (the flight path) — into value without touching the parcel. Exam skill: match the observation to its principle by asking what MECHANISM moved the value.
Worked example
Four observations from one afternoon: (1) a buyer refuses to pay $470,000 for a house because an equivalent one lists at $445,000; (2) a rumor of a future transit station lifts nearby prices 8% before a shovel turns; (3) a $95,000 kitchen adds $40,000 at sale; (4) the third bathroom added to a two-bath house adds $18,000, but a fourth would add $4,000 against a $25,000 cost. Name each principle.
(1) Substitution — the equally desirable alternative caps the price; this is the sales comparison approach happening in the wild. (2) Anticipation — value is present worth of expected future benefits; the station exists only in expectation, and expectation is enough. (3) Contribution — the kitchen is worth its market-added $40,000, not its $95,000 invoice. (4) Increasing/decreasing returns — the third bath's marginal contribution justified its cost; the fourth's $4,000-against-$25,000 sits past the point of diminishing returns, where investment stops. Four observations, four principles — and note how (3) and (4) differ: one prices a feature, the other times the stopping point.
Common exam pitfalls
Explaining everything with supply and demand.
The exam wants the SPECIFIC mechanism — substitution's alternative, anticipation's future, contribution's added value.
Confusing contribution with diminishing returns.
Contribution values one component's addition; increasing/decreasing returns describes the TREND across successive additions.
Forgetting which principle powers which approach.
Substitution → sales comparison (and cost); anticipation → income; contribution → adjustments everywhere.
Substitute the price, anticipate the future, contribute the difference — and stop building when returns turn down.
Recap
- Substitution: ceiling at the equal alternative
- Anticipation: present worth of expected benefits
- Contribution: added value, not cost
- Balance + diminishing returns: proportion and the stopping point
- Surplus productivity: residual income accrues to land
- Conformity/progression/regression; change, competition, externalities
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