43 Chapter 3: Investment analysis Figure 3.1: Student payback period Source: Lightcast impact model. Cumulative net cash flow (millions, undiscounted) Years out of school $400 $300 $200 $100 $0 –$100 0 4 8 12 16 20 24 30 28 26 22 18 14 10 6 2 32 34 36 38 $500
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