A small factory had to stop operations when an essential piece of machinery broke down. No one could get the machine operating. An outside expert was finally called in. The expert looked over the situation for a moment, then took a hammer and gently tapped the machine at a certain spot. It began running again immediately and continued to run as if nothing had ever been wrong. When the expert submitted her bill for $1,000, the plant supervisor hit the ceiling and demanded an itemized bill. The bill the woman submitted was as follows: For tapping the machine $ 1.00 For knowing where to tap $999.00