“…The mathematical flaws in the first paper of G D A (later Sir Donald) MacDougall for the Barlow Commission, which introduced shift‐share, have been detailed elsewhere and a corrected MFP model has been developed (Gardiner et al, ; Johnston & Huggins, ; Lamarche, Srinath, & Ray, , Ray, ; Ray, Lamarche, & Beaudin, ; Ray, MacLachlan, Lamarche, & Srinath, ). MacDougall’s most serious error was to include the national growth rate of 22.3% for the period 1923–1937 in with the industry‐mix effect, a conceptual error corrected in the Dunn shift‐share model (Table ).…”