Key takeaways
– The Willie Sutton Rule (aka Sutton’s Law) says: prioritize the obvious, concentrate effort on the places where results/rewards are concentrated — “because that’s where the money is.”
– It’s a practical heuristic used in investing, business, medicine, accounting and other fields to allocate time and resources for highest returns or fastest answers.
– The rule favors “low-hanging fruit” and high-probability actions but has trade-offs: it can miss long-tail opportunities and create concentration risk.
– Apply it deliberately: identify where the value is concentrated, act with measurable criteria, and balance exploitation with some exploration.
Background and meaning
The rule is attributed to notorious bank robber Willie Sutton, who allegedly replied “Because that’s where the money is” when asked why he robbed banks. In medicine the idea is known as Sutton’s Law: when diagnosing, look for the most likely, common causes first and run tests that confirm or rule them out before chasing rare diagnoses.
At its core the rule is a resource-allocation heuristic: seek the path of highest probability and easiest success first, then move outward only if needed.
Core principles
– Concentration of rewards: Most returns or problems are often concentrated in a few places (Pareto/80-20).
– Probability-first thinking: Favor high-probability, high-impact options before rare, uncertain paths.
– Cost-benefit prioritization: Prioritize actions with the best expected return relative to cost (time, money, risk).
– Simplicity and speed: Solve the obvious quickly to conserve resources for harder or rarer cases.
Practical, repeatable steps (general framework)
1. Define the objective
• What outcome are you trying to achieve? (profit, diagnosis, cost reduction, market share)
2. Map where value (or problems) is concentrated
• Use data to identify top customers, top cost centers, most common diagnoses, or highest-return investments.
3. Rank opportunities by expected value and cost
• Estimate expected return = probability of success × magnitude of outcome minus cost.
4. Attack the top items first
• Allocate time, capital and people to the highest-ranked opportunities.
5. Use fast, cheap tests or pilots
• Validate before scaling: A/B tests, small investments, initial labs/imaging, or focused accounting audits.
6. Measure and learn
• Track results, compute actual ROI, and compare to expectations.
7. Iterate and expand
• If the top approaches fail or saturate, move to next items; keep some allocation for exploration of new or rare opportunities.
Applying the Willie Sutton Rule: Domain-specific steps and examples
Investing
– Goal: maximize risk-adjusted returns.
– Steps:
1. Decide strategy (indexing, value, growth, income).
2. Screen for high-probability candidates that fit your strategy (e.g., broad-market index funds for diversification; blue-chip companies with consistent cash flow for income).
3. Prioritize investments with clear fundamentals (earnings, cash flows, margin of safety) or proven market breadth.
4. Start with larger, more transparent positions and use position sizing, stop-losses and diversification limits to control concentration risk.
5. Reallocate gains into other opportunities or maintain a reserve for exploration.
– Example: A new investor deploys 70% into low-cost broad-market ETFs (where the returns historically are), and 30% into selective single-stock or sector bets.
Business strategy and operations
– Goal: increase profit, efficiency, or revenue.
– Steps:
1. Identify top revenue-generators and top-cost drivers (sales by customer/product, expense categories).
2. Apply the 80/20 rule: focus sales efforts on top customers and improve margins on best-selling products.
3. Stop or outsource low-value activities that drain resources.
4. Run pilot improvements on the biggest pain points first.
– Example: A retailer finds 20% of SKUs generate 80% of sales — optimize inventory, promotions and supplier terms for those SKUs before trimming the long tail.
Management accounting / cost reduction
– Goal: highest-cost savings for the least effort.
– Steps:
1. Use activity-based costing to identify largest cost buckets.
2. Prioritize cost-reduction efforts where the absolute savings potential is highest.
3. Implement controls and monitor outcomes.
– Example: Focus on renegotiating supplier contracts that represent 50% of COGS rather than optimizing a minor administrative expense.
Medicine / clinical diagnosis (Sutton’s Law)
– Goal: make accurate and efficient diagnoses with minimal unnecessary testing.
– Steps:
1. Start with a thorough history and physical exam to establish pre-test probability.
2. Order the most informative, low-cost tests that rule in/out common and dangerous conditions first.
3. If first-line tests are negative or inconsistent with clinical picture, escalate to less likely causes or advanced diagnostics.
4. Reassess continually; avoid broad shotgun testing unless clinically justified.
– Example: For chest pain, start with ECG and troponin to rule out acute coronary syndrome before pursuing rare metabolic causes.
Science and R&D
– Goal: maximize knowledge or product progress per dollar/time.
– Steps:
1. Prioritize experiments with the highest information per unit cost (high signal-to-noise).
2. Use quick, low-cost experiments or prototypes to validate hypotheses before large-scale trials.
3. Reserve a small fraction of budget for blue-sky research.
– Example: Validate a key technical assumption with an inexpensive prototype before funding a full product development program.
Limitations and pitfalls
– Missed innovation: Always “going where the money is” can miss disruptive opportunities that start small.
– Concentration risk: Overfocusing can increase vulnerability if conditions change.
– Confirmation bias and laziness: The heuristic can be misused as an excuse to avoid necessary deeper analysis.
– Ethical/legal concerns: The original phrase’s bank-robbery provenance is metaphorical; don’t equate “easy money” with unethical shortcuts.
– Over-simplicity in complex domains: Some problems require broader differential diagnosis or exploration.
How to mitigate risks while using the rule
– Allocate a deliberate exploration budget (e.g., 10–20% of time/capital) for long-tail opportunities.
– Use diversification and position limits to reduce concentration risk.
– Require evidence thresholds for stopping exploration or for escalating to research on rarer hypotheses.
– Regularly review outcomes and update prioritization lists with new data.
Quick checklist for applying the Willie Sutton Rule
– Objective defined? Yes/No
– Data available to locate high-value targets? Yes/No
– Ranked list of opportunities by expected value? Yes/No
– Pilot test designed for top items? Yes/No
– Measurement plan and review cadence set? Yes/No
– Exploration/reserve allocation set? Yes/No
Example mini case: A small software company
– Problem: growth is slow and resources are limited.
– Apply Sutton Rule:
1. Analyze revenue by customer — discover top 10% of clients provide 60% of revenue.
2. Focus account management and product enhancements on those top clients to increase retention and upsells (high probability, big payoff).
3. Run a pilot integration for top clients to demonstrate ROI before broad rollout.
4. Keep a small product team experimenting with new features for potential future markets.
Conclusion
The Willie Sutton Rule is a practical and widely applicable heuristic: put resources where the returns are most concentrated and where the probability of success is highest. It’s most effective when paired with data, quick validation, and a conscious balance between exploiting obvious opportunities and exploring promising but uncertain ones.
Source
– Investopedia, “Willie Sutton Rule” — (accessed 2025-10-16)
Continuing from the previous discussion of the Willie Sutton Rule and Sutton’s Law, below are additional sections that expand on practical application, sector-specific examples, limitations, and an implementation checklist to help you apply the rule in real decisions.
Origins and attribution (brief)
– The popular phrasing of the Willie Sutton Rule—“Because that’s where the money is”—is attributed to bank robber Willie Sutton when a reporter asked why he robbed banks. The phrase and the associated diagnostic principle in medicine (Sutton’s Law) evolved into a general heuristic: look first where success (or the problem) is most likely to be found. For more background, see Investopedia’s summary. (Source
Practical steps to apply the Willie Sutton Rule
1. Define the objective clearly
• What counts as “money” or success in this context? Revenue, cost reduction, patient recovery, diagnosis accuracy, market share?
2. Identify the highest-yield targets
• Use data to rank opportunities by expected return, frequency, or impact. (Pareto/80-20 thinking is helpful.)
3. Evaluate effort versus reward
• Estimate the time, cost, and risk of pursuing the top targets vs. lower-probability ones.
4. Pursue the low-friction, high-return items first
• Execute on the obvious, high-probability actions quickly to capture gains and learn.
5. Monitor results and re-prioritize
• Measure outcomes and reallocate resources as necessary; iterate quickly.
6. Reserve a portion of resources for exploration
• Keep some budget/time for higher-risk innovations so you don’t miss out on longer-term upside.
7. Document assumptions and outcomes
• Record why an area was prioritized and whether results matched expectations to improve future decisions.
Examples by domain
Finance and investing
– Example (dividend-income focus): If you want stable cash flow, begin with large, established dividend-paying companies in sectors you understand. Screen for dividend yield, payout ratio, and free-cash-flow parity. These choices are “where the money is” for income investors—lower upside than startups but higher predictability.
– Example (active stock picking): Instead of chasing obscure microcaps, many investors apply the Willie Sutton Rule by starting with companies with clear earnings, steady margins, and simple business models. That reduces the risk of hidden problems.
Corporate strategy and sales
– Example (customer focus): A company finds that 20% of clients account for 80% of revenue. Apply the Willie Sutton Rule by focusing account management, upsell, and retention efforts on that top 20% first.
– Example (sales prospecting): If certain industries produce most closed deals, prioritize outreach to similar companies instead of cold-targeting unrelated segments.
Accounting and cost management
– Example (activity-based costing): Prioritize cost analysis where the largest expenses exist—e.g., raw materials, direct labor, or logistics—because savings there will have the biggest financial impact. Auditing every small expense first is inefficient.
Medicine and diagnostics (Sutton’s Law)
– Example: A patient presents with sudden chest pain and classic signs of myocardial infarction (MI). Following Sutton’s Law, clinicians first evaluate and test for MI (ECG, troponin) because it’s the most likely and most dangerous cause—rather than initially testing for several rare causes.
– Caveat: Always rule out immediately life-threatening alternatives as clinical judgment dictates; Sutton’s Law is a guide, not a substitute for thoroughness.
Product development and R&D
– Example (MVP approach): Build and test a minimum viable product where demand is already visible (existing customer requests, high-engagement features) before spending resources on speculative features or new markets.
– Benefit: Faster validation, quicker revenue or user feedback, and reduced wasted development time.
Cybersecurity and fraud prevention
– Example: If most intrusion attempts exploit a few common vulnerabilities, patch and harden those first (e.g., default credentials, missing security patches) rather than spending all resources on exotic attack scenarios.
Fundraising and nonprofit strategy
– Example: Rather than broadly soliciting small donations equally, target the top donors or donor segments that historically give the largest amounts or show the most engagement.
Concrete numeric example (business prioritization)
– Scenario: A firm can pursue cost-savings opportunities of $500k, $120k, and $20k annually, requiring 3, 2, and 1 months of effort respectively.
– Willie Sutton approach: Start with the $500k opportunity. If it requires 3 months, yields 500k/3 ≈ $167k per month—higher return per month than other projects. Doing the largest first gives immediate meaningful savings to redeploy.
Limitations and risks
– Over-simplicity and bias: The rule can encourage tunnel vision—focusing only on obvious gains while missing structural risks or disruptive opportunities.
– Short-termism: Prioritizing immediate returns may underinvest in long-term strategic assets (R&D, brand, culture).
– Ethical/legal concerns: “Going where the money is” must be constrained by legal and ethical considerations. The Willie Sutton anecdote originates in criminal activity; emulate the heuristic, not the illegal behavior.
– Misidentification risk: If your data or assumptions are wrong, “obvious” choices can be costly; always validate high-impact assumptions.
Balancing Sutton’s Rule with exploration (exploit vs. explore)
– Recommendation: Allocate resources using a split (e.g., 70/30 or 80/20) between exploiting obvious high-return opportunities and exploring promising but uncertain options. The exact split should depend on industry dynamics, competitive landscape, and organizational tolerance for risk.
Implementation checklist
– Gather data on revenue, costs, customers, problems.
– Rank opportunities by expected return and probability of success.
– Assess resource needs and time-to-value for each opportunity.
– Select top priority items that maximize return per unit of resource/time.
– Execute, measure, and document results.
– Rebalance: redeploy gains to other prioritized areas or exploratory experiments.
Practical tips for managers and practitioners
– Use metrics (LTV, CAC, margin, time-to-revenue) to make prioritization objective.
– Use small experiments to validate assumptions before large investments.
– Communicate trade-offs and why certain opportunities are prioritized.
– Create a “fast wins” list of 3–5 items you can execute quickly and that produce meaningful impact.
– Keep a backlog for lower-priority but noteworthy ideas—process them periodically.
Concluding summary
The Willie Sutton Rule—“go where the money is”—is a pragmatic heuristic that prioritizes obvious, high-impact opportunities before chasing low-probability or marginal gains. Across investing, accounting, medicine, business strategy, and product development, it encourages focusing limited resources where they will produce the largest immediate return. However, used alone it can lead to short-term bias and missed innovation, so best practice is to pair it with disciplined measurement, validation, and a calibrated allocation to exploratory work. Applied thoughtfully, Sutton’s approach speeds decision-making, reduces waste, and concentrates effort on what matters most.
Source
– Investopedia: “Willie Sutton Rule.”