Does MOND work? and the origin of inertia

MOND correctly predicts galaxy rotation curves, but fails in galaxy clusters and other evidence for dark matter. Does this mean that MOND is incorrect? The original author of MOND suggested that MOND should come from modified inertia, but a phenomenological explanation of MOND has never been found. There are many proposals of modifiying inertia based on Mach’s principle and the relativity of acceleration, but shouldn’t these approximate to MOND’s formulation?

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