Zero-Based Thinking: If You Could Start Over, Would You Choose This

Zero-based thinking is most useful when you understand what it's working against.

The sunk cost fallacy is the tendency to continue a course of action because of previously invested resources — time, money, effort, identity — rather than because of expected future value. A sunk cost is one that cannot be recovered regardless of what you do next. Rationally, it should be irrelevant to forward-looking decisions. Psychologically, it exerts enormous pull.

The classic experimental demonstration: people given a ski trip ticket they've paid for are more likely to drive through a blizzard than people given the ticket for free, even when the expected enjoyment and the risk are identical. The sunk cost ($X already spent) produces behavior it has no logical claim to produce.

At larger scales and longer time horizons, the sunk cost problem gets worse. The longer you've been in something, the more you've invested in it — financially, relationally, reputationally — and the harder it becomes to evaluate it on its actual current merits. The past investment becomes a weight that distorts your forward vision.

This is compounded by several related cognitive tendencies:

Consistency bias. People are motivated to appear consistent with their past commitments. Changing your mind looks like weakness, unreliability, or poor judgment. The social cost of being seen to have made a mistake is itself a real cost that people seek to avoid by continuing commitments rather than updating them.

Anchoring to original conditions. When you made a decision, it may have been the right decision given the information you had at the time. But information has changed. Circumstances have changed. You have changed. Anchoring to the original decision — "this was a good idea when I started it" — as a reason to continue it ignores all the updating that should have happened since.

Identity integration. Over time, commitments become part of identity. The business isn't just something you do — it's who you are. The degree isn't just a credential — it's what you spent the formative years of your life on. Leaving these things requires an identity revision, not just a practical decision, which is a different order of difficulty.

Zero-based thinking cuts through all of these by removing the past from the decision frame. It asks: not "given all I've invested," but "starting now, with what I know, would I choose this?" This reframe doesn't make the decision easy. But it makes it honest.

The term "zero-based" has a separate origin in finance: zero-based budgeting (ZBB), developed by Peter Pyhrr at Texas Instruments in the late 1960s and popularized when Jimmy Carter applied it to the Georgia state government. Traditional budgeting starts from last year's numbers and adds or subtracts adjustments. Zero-based budgeting starts from zero every cycle — every program must justify its existence and cost from scratch, with no assumption that past funding is a baseline entitlement.

ZBB is cognitively expensive — it requires rebuilding the justification for everything every year — and in practice, most organizations use a hybrid: zero-based reviews on a longer cycle (every 3-5 years) for major programs, with incremental adjustments between reviews.

The same logic applies to personal zero-based thinking. You can't question every commitment constantly without becoming ungovernable. But on a longer cycle — annually, or at major life transitions — systematic review of major commitments prevents the drift into staying-by-default.

Tracy adapted the concept to personal decision-making with the specific framing: "Knowing what I now know, would I get into this relationship/job/investment/project if I were starting over today?" The genius of this framing is that it includes "knowing what I now know" — which means it incorporates all the information that was unavailable at the time of the original decision. The past decision was made with different information. This question evaluates the current reality with current information.

"Would I start this?" is deceptively simple. Applied well, it has internal complexity.

What exactly is "this"? Being specific matters. "This business" is too broad. "This business partnership with these terms and this partner" is a specific commitment that can be evaluated. "This relationship" might mean "this particular person" or "a relationship with this structure and these agreements" — and those might have different answers. Precision in defining what you're evaluating prevents the question from being too easy or too hard.

Starting from what baseline? Zero-based thinking assumes you could realistically start over — that there's a genuine choice available. Some things can't be undone: you have children, you have a medical condition, you've already taken irreversible action. The question still has value even in these cases (it clarifies what you're dealing with), but the answer is more constrained. Be honest about what's actually variable and what isn't.

What would starting fresh cost? Zero-based thinking is sometimes misunderstood as ignoring future costs. It doesn't. It ignores past costs (sunk) but fully incorporates future costs. "Would I start this business partnership knowing I'd eventually need to buy out my partner at $X?" or "Would I enter this mortgage knowing I'd need to sell in 5 years and might be underwater?" — these include real future costs and are legitimate zero-based evaluations.

What's the alternative? Zero-based thinking answers "would I choose this?" but the answer matters in relation to "compared to what?" If the alternative is unclear or unappealing, a "no" to the current situation doesn't produce actionable clarity. A useful version of the practice pairs the question with explicit alternatives: "If I were not in this situation, what would I actually do with my time and resources instead?"

The reason most people don't practice this regularly is not that the question is intellectually hard. It's that a honest "no" creates an obligation.

Once you've clearly seen that you wouldn't choose something fresh, you can't unsee it. You have information about a gap between what you've chosen and what you'd choose. That information creates pressure — not certainty about what to do, but the loss of innocence that comes with clarity. You can't continue the same way while genuinely believing it's the right choice.

This is uncomfortable. It's much easier to maintain a low-grade ambient dissatisfaction that never crystallizes into a clear "I wouldn't choose this" — because crystallized truth demands a response.

There are three honest responses to a "no" answer:

1. Act on it. Change the situation — exit, renegotiate, restructure. This has real costs and requires real courage.

2. Accept and commit to the constraint. Some things genuinely cannot be changed, or the costs of changing them are higher than the costs of staying. If you've done a clear-eyed analysis and staying is the rational choice, commit to that choice rather than continuing in half-in-half-out ambivalence. Choosing to stay is different from staying because you haven't chosen to leave.

3. Redesign the thing. Sometimes the answer to "would I start this?" is "not in this form." The partnership is worth continuing but the terms need renegotiation. The job is right but the role has drifted into something different than what you signed up for. Zero-based thinking can clarify not just whether to continue but what you'd need to change to make continuing the right call.

What's not a useful response: returning the question to fog so you can avoid the discomfort of having clarity. This is what most people do. They ask the question, get a "no" they don't want to deal with, and stop asking.

The practice that actually works: a scheduled, deliberate review at regular intervals.

Cadence. Once a year works for most major commitments. Some practitioners review on birthday or New Year — natural stopping points with built-in reflective energy. Others tie it to quarterly reviews. The key is that it's scheduled, not reactive — you're not waiting until things are bad enough that you're forced to ask.

Scope. Focus on the major commitments: work or business arrangements, key relationships, financial commitments (mortgages, investments, major ongoing costs), living situation, significant ongoing projects. The minor ones can be left to organic review.

Format. The question should be asked in writing, not just in thought. Writing forces specificity and creates a record. Write down: what the commitment is, why you entered it originally, what's changed since then, and your current answer to "would I start this today?" If the answer is no, write down what would need to change to make it a yes, and whether that change is realistic.

Review of previous answers. If you've done this before, go back. Have your answers changed? Did you act on a "no"? Did the situations you marked as "yes" actually develop the way you hoped? The track record tells you something about both the quality of your zero-based assessments and the quality of your follow-through.

The alternative is drift. You stay in situations because you're in them. Time passes. The situation changes, you change, the fit deteriorates — but no one moment is bad enough to trigger a reconsideration. You accumulate commitments from across your life that made sense when you entered them and have never been re-evaluated.

The people who end up most trapped are often not people who made dramatically bad choices. They're people who made reasonable choices, never questioned them again, and slowly found themselves in a life that bears little relation to what they'd actually choose today.

Zero-based thinking is not anti-commitment. The point is not to be perpetually restless, never satisfied, always reconsidering. Some things that started as the right choice remain the right choice, and asking the question confirms that — which is itself valuable. You're not stuck; you're choosing.

The distinction Tracy was pointing at: there's a difference between commitment and inertia. Commitment is when you've assessed your options and chosen. Inertia is when you're continuing because you haven't chosen to stop. Both can look identical from the outside — and from the inside — for years.

The question cuts them apart. And once you see which one you're in, you have to decide what to do with that knowledge.

That's the uncomfortable part. It's also the useful part.