Why the fleet comparison does not use GDP

Does this comparison of the Jutland fleets include GDP and wider economic statistics?

No. The comparison stays with construction and technology because British figures are consolidated while comparable German and other national series would require extensive harmonisation.

British historical statistics are available in a convenient consolidated reference, whereas equivalent German economic data is dispersed across several exhaustive works. Making the figures genuinely comparable would require an economic historian to reconcile definitions and values rather than simply copying headline totals. A broader comparison would also need equivalent evidence for the United States, Japan, France, Chile, Argentina, and Brazil. The comparison therefore stays with fleet construction and technology instead of using national GDP as a shortcut for naval power.