Description
Return benefit*(1+rate)^(-year), allowing signed benefit and fractional year.
Agroforestry cost and benefit terms depend on labor exposure, shared allocations, grants and discount periods. Person-hours differ from elapsed crew-hours, and a single discounted benefit differs from a complete investment appraisal. Prices, allocations and discount rates must be supplied on compatible bases.
Return benefit*(1+rate)^(-year), allowing signed benefit and fractional year.
When to use this tool
Use Agroforestry Benefit Caller Discount Term when checking the stated tree/crop cost, labor or discounted-benefit contribution.
How to use the tool and how it works
- Enter benefit, year, suppliedRate. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read presentValue. Use the output convention below.
Require year>=0 and suppliedRate>-1. Return benefit*(1+rate)^(-year), allowing signed benefit and fractional year.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| benefit | Benefit | Required. Finite number. |
| year | Year | Required. Finite number; minimum 0. |
| suppliedRate | Fractional discount rate per year, greater than -1; no suitable rate is selected. | Required. Finite number; strictly above -1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| presentValue | Present Value | Required. Finite number. |
{
"input": {
"benefit": 100,
"year": 2,
"suppliedRate": 0.1
},
"output": {
"presentValue": 82.64462809917354
}
}Limitations and assumptions
- Rate is a fraction per matching year; one discounted cash flow does not establish investment value or a suitable discount rate.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Build a complete budget with verified costs, timing, uncertainty and applicable agreements for actual investment, labor or grant decisions.
References
Similar or alternative tools
- Agroforestry Establishment Cost Tree Share
Return trees*perTree+sharedCost-grant and its per-tree equivalent.
- Agroforestry Harvest Labor One Component
Person-hours=units*minutes/60; elapsed hours divide by workers; cost multiplies person-hours by hourlyCost.