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We should remember that there have been major shifts over the time period shown:

Imports/capita ($K) are more than 5 times higher than 1972. In the 20s, we had the advent of China as manufacturer to the world. This does change domestic productivity,

There has been a major shift to knowledge-based industries with difficult-to-measure output.

An aging population means that an increasing share of GDP is necessarily devoted to public health and social care with value to society not appropriately measured

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Another great post, can't thank you enough for sharing your work and knowledge

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Thanks Philip - as an interested layperson, I really appreciate your careful and illuminating analysis.

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