What Entrepreneurs Can Learn from The Little Book of Common Sense Investing
Maya sat at her kitchen table at midnight, comparing two plans for her small software startup. One was a flashy growth agency promising to "out-market" every competitor within a quarter, billed monthly with a long list of add-on fees. The other was a boring plan: keep doing the steady work of retaining customers, fix onboarding, and reinvest the modest profit each month. The agency's pitch deck was full of case studies about clients who supposedly tripled revenue overnight. Her gut said the flashy option felt like progress and the boring option felt like standing still, even though she suspected the fees alone would eat much of what the agency claimed it would add. She closed the laptop without deciding, unsettled by how hard it was to tell real edge from an expensive story.
The whole book, compressed
This edition works through 4 core lessons — take them one at a time, not all at once.
What's different for your conditions
Tap whichever ones sound like you. Nothing here is sent or saved — it's just for your own noticing.
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The core lessons, applied to you
Costs compound against you just as relentlessly as returns compound for you
Maya's team once stacked several subscription tools, a boutique PR retainer, and a paid consultant in the same year, each pitched as small relative to the expected upside. A year later the combined recurring spend had quietly outpaced the revenue those tools were supposed to generate. Practice: Once a quarter, list every recurring fee the business pays and project it forward at current volume, not just this month's invoice. Cut or renegotiate anything without a clear, current contribution to revenue, and treat every new recurring cost as a permanent addition to the baseline, not a trial.
Once a quarter, list every recurring fee the business pays and project it forward at current volume, not just this month's invoice. Cut or renegotiate anything without a clear, current contribution to revenue, and treat every new recurring cost as a permanent addition to the baseline, not a trial.
Trying to beat the market usually costs you the market's own return
Every few months Maya's business chased whatever tactic a competitor or a conference speaker was excited about, abandoning the previous experiment before it had time to mature. The constant switching cost time and focus, and her steady base of satisfied customers grew slower than it would have with no changes at all. Practice: Pick one or two growth levers that already show real evidence of working, commit to them for a full measured cycle, and require any new tactic to prove itself against that baseline first. Treat the urge to switch as a signal to look harder at the data, not a reason to act immediately.
Pick one or two growth levers that already show real evidence of working, commit to them for a full measured cycle, and require any new tactic to prove itself against that baseline first. Treat the urge to switch as a signal to look harder at the data, not a reason to act immediately.
Broad diversification protects you from being wrong about any one bet
Maya's revenue relied on one large client for a significant share of monthly income, and when that client abruptly downsized, cash flow tightened within weeks. The concentration had felt efficient while it lasted, since one big account was simpler to manage than several smaller ones. Practice: Set a rule capping how much revenue one customer or channel can represent, and treat crossing that line as a trigger to build a second source. Review the mix on a fixed schedule so concentration risk gets caught before a crisis forces the review.
Set a rule capping how much revenue one customer or channel can represent, and treat crossing that line as a trigger to build a second source. Review the mix on a fixed schedule so concentration risk gets caught before a crisis forces the review.
Patience is the quiet, unglamorous edge
For a founder, the strongest advantage is rarely a clever new tactic; it is showing up consistently long enough for small, compounding improvements in product and reputation to add up. Every founder faces stretches where growth looks flat and a dramatic pivot seems more exciting than steady iteration. The businesses that last are usually the ones that kept refining fundamentals through those flat stretches instead of repeatedly restarting, because restarting resets the compounding clock every time.
Cutting every recurring cost can starve a genuinely useful tool, and diversifying revenue too aggressively can spread a small team too thin. Treat cost control, diversification, and patience as a running conversation rather than absolute rules: prune where a cost adds nothing measurable, diversify deliberately rather than reflexively, and give any change enough time to show its effect before reacting again.
Name one thing, honestly
Which recurring cost or single customer relationship in your business have you never actually measured against what it costs you to keep?
Good. Now look back at the "Try this" line under whichever lesson feels most connected to what you just wrote, and treat that as this week's actual assignment — not all 4 at once.
The practices from this edition
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Run this for seven days
Set a rule capping how much revenue one customer or channel can represent, and treat crossing that line as a trigger to build a second source. Review the mix on a fixed schedule so concentration risk gets caught before a crisis forces the review.