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A large ship's engine failed, and despite the efforts of numerous mechanics, it remained stubbornly silent. Desperate, the ship owners called in a veteran engineer, known for his expertise. The engineer, after a thorough examination of the engine, identified the problem area. He then took a small hammer and gently tapped a specific spot on the engine. To the astonishment of the onlookers, the engine sputtered, coughed, and then roared back to life. A week later, the ship owners received a bill for $20,000. Perplexed, they demanded an itemized invoice. The engineer responded with a breakdown: "$2 for tapping the hammer, $19,998 for knowing where to tap." The owners realized they had paid not just for the physical labor, but for the engineer's years of accumulated knowledge and experience, which allowed him to pinpoint the exact location for the repair.