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bezosnbspinstructs-all-of-his-senior-execs-to-read-the-goalTwo years in business school and stints as an entrepreneur and business consultant had mostly convinced me that all management theories are basically a crock. The technical tools I learned in business school, such as accounting and financial analysis, were quite useful in the real world. But the abstract theories I was taught were rarely superior to good old-fashioned commonsense. But there was one exception, which no one in business school told me about, but which I discovered through a friend who advises entrepreneurs on their business strategy: the theory of constraints (TOC). At The Week