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Perpetuities

Asset providing a fixed amount of cash flow

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A perpetuity is an asset that provides a periodic fixed amount of cash flow forever.

cash flow diagram

Endowments and trust funds, and long lived assets like oil wells or gas fields can be regarded as perpetuities.

The value of a perpetuity can be calculated as

PV = F / r         (1)

where

PV = present value

F = F1 = F2  .. Fn  = fixed amount of cash flow per period

r = discount rate of return (per time period)

Growing Perpetuity

If the cash flow grows in a constant rate the value of the perpetuity can be expressed as

PV = F / (r - g)        (2)

where

g = growth rate of cash flow (per time period)

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Related Topics

  • Economics - Engineering economic concepts - cash flow diagrams, discount rate, internal rate of return - IRR, income taxes, inflation

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