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Bedding makers can't make mattress for want of foam. RV manufacturers can't get enough "air conditioners, fridges, furniture". Often, the pivotal items are obscure and utterly critical, like the $1 "flat steel form ties," without which home construction halts.

"For the want of a nail, the shoe was lost." We've understood that tightly coupled systems have cascading failures since the 13th century. "Resiliency" is inefficient - but only if you ignore what happens when brittle systems fail.

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