Every major geopolitical and macroeconomic disruption since 1973 has produced compound outcomes — where the simultaneous activation of multiple signals produces impacts 1.8 to 2.6 times worse than the sum of independent sensitivities. Standard models cannot see this. They are not designed to. PHM is.
PHM does not forecast. It reads the signal environment more accurately than it is currently being read — and maps the transmission path from that environment to a specific P&L line, with a named source, a historical precedent, and a preparation window.
The BIS 2023 Working Paper on compound macro events documents cross-sector correlation of 1.8–2.6× in simultaneous disruption events. This is not a PHM estimate. It is a published, peer-reviewed coefficient applied to the specific signal configuration active in April 2026. The Meridian Series cases show exactly what it produces — sector by sector, function by function, with named sources at every step.
The Meridian Series is structured as a compound read — not six independent cases but six layers of the same signal environment, each one building on the last. Case 03 inherits Cases 01 and 02. Case 04 inherits 01 through 03. By Case 06, the compound intelligence spans five sectors, six functions, and the full transmission path from Hormuz to the B2B SaaS pipeline freeze.
PHM Engine is the API licence that puts compound signal intelligence inside your practice. Not a report. Not a dashboard. A methodology deployed through your existing client relationships — producing the sentence that no Bloomberg terminal, no Big Four framework, and no internal model produces at any price.
These are not hypothetical cases. Every number, every mechanism, every compound factor is calibrated to the signal environment active as of April 2026. The IMF this week declined to publish a conventional forecast — the first time in WEO history. PHM has been mapping the compound mechanism that made that necessary since March 2024.