UK NSDP/NPDP Historical Time Series, 1945–2025

This dataset supports the working paper *Beyond GDP: Measuring theProductive Economy* (Roberts 2026) and the book-length manuscript ofthe same title (forthcoming, submission April 2026). It contains: 1. The **UK 1945–2025 NSDP/NPDP time series** — 18 observations at five-year intervals (with the 2007 financialisation peak added as an intermediate observation), decomposing UK nominal GDP into productive output (NSDP), non-property financial speculation (S − P), and property speculation (P) according to the identity ``` GDP = NSDP + (S − P) + P ``` 2. **Cross-country decompositions** for the United States, Germany, South Korea, China, and the United Kingdom for the 2024/2025 reporting year. 3. **Intermediate calculations** supporting the UK series — specifically, the derivation of the property-speculation premium σ from the Nationwide house-price index and the ONS CPI, and the derivation of the non-property financial-speculation component from the ONS SIC-K financial-sector gross value added series. 4. A **Python reproducibility script** (`compute_nsdp.py`) that recomputes every number in the UK series from the source inputs and verifies that the decomposition identity holds for every observation.