Description
Return signed water increment and (objectiveAfter-objectiveBefore)/increment.
Farm economic comparisons depend on fixed/variable costs, opportunity-cost assumptions, depreciation, discount periods and explicit payment limits. A partial margin or finite-difference response differs from total profitability or an optimization-derived shadow price. Supplied rates and tax flags do not determine actual obligations.
Return signed water increment and (objectiveAfter-objectiveBefore)/increment.
When to use this tool
Use Irrigation Water Shadow Price Term when checking the stated caller-defined cost, margin, cap, valuation or sensitivity term.
How to use the tool and how it works
- Enter objectiveBefore, objectiveAfter, waterBefore, waterAfter. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read waterIncrement, marginalObjectivePerWater. Use the output convention below.
Require waterAfter!=waterBefore. Return signed water increment and (objectiveAfter-objectiveBefore)/increment.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| objectiveBefore | Objective Before | Required. Finite number. |
| objectiveAfter | Objective After | Required. Finite number. |
| waterBefore | Water Before | Required. Finite number. |
| waterAfter | Water After | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| waterIncrement | Water Increment | Required. Finite number. |
| marginalObjectivePerWater | Finite difference in supplied objective per water increment, not an optimization-derived dual/shadow price. | Required. Finite number. |
{
"input": {
"objectiveBefore": 1000,
"objectiveAfter": 1200,
"waterBefore": 100,
"waterAfter": 150
},
"output": {
"waterIncrement": 50,
"marginalObjectivePerWater": 4
}
}Limitations and assumptions
- This is a finite-difference objective slope, not an optimization-derived shadow price or validated causal water response.
- 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
Use a complete verified budget and suitable economic analysis; consult qualified financial/legal professionals for actual investment, contract or tax decisions.
References
Similar or alternative tools
- Fertilizer Marginal Response One Step
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- Crop Revenue Moisture Price Cross Term Tool
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