Often used in capital budgeting, IRR is the interest rate that makes net present value of all cash flow equal zero.
IRR经常用于资本预算，它是使得所有现金流动的净现值为零的利率。
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So you sort of have a zero-base budgeting model of, "If we were a start-up, what would we do? How would we organize to deliver value to the customers?"