Fine-grained: When we push, we make a list of exactly the nodes that need to be updated. When we pull, we only recalculate those nodes and leave all the others alone.
}This is the textbook definition. It’s simple but exponentially slow — fib(40) would take a noticeable pause. Fine for small inputs and clarity.
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He pointed to the decline of labor unions as one reason why so many people don’t apply for benefits in the first place. Labor union membership fell to a historic low of 9.9% in 2024 and made little gains in 2025, according to the BLS.