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As AI datacenter investments reach unprecedented scales, critical comparisons to historical mega-projects like railroads and the Marshall Plan expose a fundamental concern: immediate economic return. While railroads generated tangible value immediately after construction, today's AI investments lack clear evidence that their massive scale creates proportionate user benefits. The short six-year depreciation cycle of GPUs combined with unproven long-term profitability mirrors the over-investment patterns that preceded historical financial crises like the Panic of 1873 and 1893.