Source: https://guthlabs.ai/docs/instruments/real-gdp-gdp-deflator-converter/implementation/

instrument implementation / implementation-contract

# Real GDP / GDP Deflator Converter implementation

A source-bound implementation contract for Real GDP / GDP Deflator Converter; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-178

**Effect**: Computation or source lookup only

## Input and validation requirements

A zero deflator creates an undefined division and must be rejected. The specification also has no genuine formula branch, and ambiguous ratio-versus-index input can produce materially different results if conventions are not explicit.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "nominal_GDP": 2400000000000,
    "deflator_index": 120,
    "currency": "USD"
  },
  "expected_outputs": {
    "real_GDP": 2000000000000,
    "currency": "USD"
  },
  "working": "deflator/100 = 120/100 = 1.2\nreal_GDP = 2,400,000,000,000 / 1.2\nreal_GDP = 2,000,000,000,000 USD"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/real-gdp-gdp-deflator-converter/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/real-gdp-gdp-deflator-converter/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/real-gdp-gdp-deflator-converter/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`