In this episode, Carl explores the tension between what’s rational on paper and what’s workable in real life. Spreadsheets say to invest lump sums immediately, keep low-interest debt, and avoid holding excess cash. The math is often right. But the spreadsheet doesn’t model loss aversion, regret, sleep, or the behavioral breaking point of being human. Strategies like dollar-cost averaging or paying off a mortgage may be mathematically suboptimal but psychologically stabilizing. Carl argues that these choices are often a form of emotional insurance, not mistakes. The key is simply to name them honestly: Sometimes the smartest line in the spreadsheet is the human factor.

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