Description
Return additionalReduction = observedReduction*additionalFraction, netReduction = additionalReduction*(1-leakageFraction) and subsidyPerNetUnit = subsidy/netReduction.
Average, incremental and marginal environmental costs answer different questions. A ratio over a finite reduction is a step average, while marginal cost describes an additional unit; meaningful comparisons need common periods, boundaries and units.
Return additionalReduction = observedReduction*additionalFraction, netReduction = additionalReduction*(1-leakageFraction) and subsidyPerNetUnit = subsidy/netReduction.
When to use this tool
Use Environmental Subsidy Additionality Caller Share when checking a supplied environmental cost contribution or comparison.
How to use the tool and how it works
- Enter subsidy, observedReduction, additionalFraction, leakageFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read additionalReduction, netReduction, subsidyPerNetUnit. Use the output convention below.
Require nonnegative subsidy, positive observedReduction, additionalFraction in (0,1] and leakageFraction in [0,1). Return additionalReduction = observedReduction*additionalFraction, netReduction = additionalReduction*(1-leakageFraction) and subsidyPerNetUnit = subsidy/netReduction.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| subsidy | Subsidy | Required. Finite number; minimum 0. |
| observedReduction | Observed Reduction | Required. Finite number; strictly above 0. |
| additionalFraction | Additional Fraction | Required. Finite number; maximum 1; strictly above 0. |
| leakageFraction | Leakage Fraction | Required. Finite number; minimum 0; strictly below 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| additionalReduction | Additional Reduction | Required. Finite number. |
| netReduction | Net Reduction | Required. Finite number. |
| subsidyPerNetUnit | Subsidy Per Net Unit | Required. Finite number. |
{
"input": {
"subsidy": 10000,
"observedReduction": 1000,
"additionalFraction": 0.5,
"leakageFraction": 0.2
},
"output": {
"additionalReduction": 500,
"netReduction": 400,
"subsidyPerNetUnit": 25
}
}Limitations and assumptions
- The additionality and leakage factors are caller-supplied shares, not estimated causal effects. Use a common reduction unit and currency; this cost ratio does not verify environmental credits or subsidy eligibility.
- 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
Assemble comparable costs and effects across the full baseline and project, and distinguish financial costs from social costs before ranking alternatives.
References
Similar or alternative tools
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