Two-track analysis
Evaluate the rational factors and the psychological factors separately. The second corrupts the first.
Munger's prescribed method for any important decision: run two analyses in parallel.
Track 1: What are the rational factors? What does the math say? What do the fundamentals suggest? What would a smart, disinterested outsider think?
Track 2: What subconscious or psychological influences are at work? Which biases is the situation activating? Whose interests are involved (including my own ego, my desire not to lose face, my sunk costs)?
The trick is keeping the tracks separate. The natural failure mode is letting Track 2 secretly drive Track 1. You "decide rationally" to buy the bigger house, but in fact your status anxiety did the deciding. You "decide rationally" to keep funding the failing project, but sunk cost and ego did the deciding.
Running both tracks explicitly catches this. If Track 1 says "the business case is marginal" and Track 2 says "but the CEO is publicly committed and would lose face if we kill it," you can at least see what's happening.
A useful habit: after any meaningful decision, write down both tracks in two columns. The rational case on the left. The psychological factors on the right. Don't decide until you've honestly populated both.
Most experienced operators run two-track analysis instinctively on other people's decisions. The hard part is doing it honestly on your own.
Examples in the wild
Most failed acquisitions have a clean Track 1 (strategic fit, synergies, financial returns) and an unspoken Track 2 (CEO ambition, board pressure, fear of losing to a rival bidder). The deal goes ahead. Track 1 was always going to win because Track 2 was the real driver.
Selling a losing position: Track 1 says the thesis is broken, exit. Track 2 says exiting locks in the loss, makes you look stupid. Track 2 usually wins. Two-track analysis catches it.
Major life decisions (jobs, houses, partners) usually look like they're being made on Track 1. Most of them are actually decided on Track 2. Forcing yourself to write both tracks down catches the substitution.
Two-track analysis is one of the mental models we apply through real cases inside the Pareto MBA — a part-time program for professionals who want to think clearly about business.