Real GDP / GDP Deflator Converter

Inspectable records

Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Area

Finance, Economics & Business (educational only — never individualized investment, tax, or legal advice)

Tranche

tranche-5

Evidence ID

t5-178

Ledger rows

1

No ledger note is attached.

Review findings

The core real-GDP conversion formula is standard under the stated index convention. The specification needs the inverse deflator formula, an explicit implied-inflation definition, period/frequency handling, and validation rules before the full claimed instrument can be verified. The educational-only label is appropriate.

Formula and scope findings

• real_GDP=nominal_GDP/(deflator/100) is correct only when deflator is an index level with 100 as the base-period value.
• The claimed ability to solve the deflator lacks an explicit inverse formula: deflator=(nominal_GDP/real_GDP)*100.
• The claimed implied-inflation output has no specified formula. The standard interpretation is inflation=((current_deflator/previous_deflator)-1)*100, but the required periods and frequency are unspecified.

Unit assumptions

• Nominal GDP and real GDP must use the same currency and scale, such as both USD or both billions of USD.
• The deflator is a dimensionless index level, not a percentage rate; 100 represents the base period.
• The real-GDP output retains the nominal-GDP currency and scale.
• Implied inflation is assumed to be the percentage change in the GDP deflator between two specified periods; it cannot be labeled annual unless the periods are one year apart.

Boundary hardening

BREAK_CLAIMED · SELF_FLAGGED

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.

Errata and corrections

No applied erratum is attached to this unique-name record.

Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

{
  "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"
}

Related workflows

No source-defined multi-instrument workflow membership is recorded.

Sources and evidence

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

• VERIFIED_LEDGER.json · VERIFIED_CLEAN
• evidence-tranche5/tranche5-results.json
• BOUNDARY_HAZARD_CATALOG.json