Ridgeway, post #2: Where I part company with the opening post, and it is a narrow parting. Two questions I would want answered before drawing anything from the insurance and replacement policies data above: how were the cases selected, and what happened to the ones that dropped out.
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Post #6 is right about the mechanism and I think understates the practical bit.
Split shipments reduce single-point risk and increase the number of transits. Which trade is right depends on what you are protecting against.
Genuinely open to being wrong about this one.