Principle
Never get deterministic about a single metric
Optimizing one metric in isolation invites delayed, invisible damage elsewhere.
Gurley illustrates with a dating site whose longer-profile experiment raised engagement but silently cut conversion months later — the risk of treating one variable as ground truth.
Instrument the downstream outcome, not just the local KPI you are moving.
“you just gotta, you gotta be really conscious of the consequence and not get too de deterministic about a single metric or a single variable and know what's important and what's on top.”Bill Gurley
Principle
Product-first instinct is nearly impossible to install after the fact
You cannot reliably teach product instinct; hire for it.
Gurley calls product instincts a chosen unfair advantage and estimates converting a non-product person to product-good happens 5% of the time or less.
Screen hard for existing product judgment rather than planning to build it.
“it probably took my whole career for me to fully understand how hard it is to hire someone who's not a product first individual and then get them to be good at it. I'm sure there, there are examples, but it's gotta be 5% or less of the use case.”Bill Gurley
Principle
Writing forces rigorous thinking and becomes a calling card
Writing forces complete thinking and doubles as a magnet for deal flow.
Gurley codified marketplace knowledge in writing (helping him reason through corner cases) and found that publishing became a calling card that drew founders to him.
Write your thinking out in full; it clarifies and it magnetizes.
“it is exactly why Bezos has his six page letter concept at Amazon. He, he believes that If you have to write it out and make it standalone and be cogent that you'll think through more of the, the problems and you'll, it'll be more cohesive”Bill Gurley
Principle
Increasing returns and power laws mean winners exceed all expectations
Under increasing returns, the largest winners are worth far more than anyone forecasts.
Gurley says the investor community's growing conviction in increasing returns and power laws is why it has become more risk-seeking and willing to fund enormous burn.
If growth compounds with size, expect and underwrite super-linear outcomes.
“that growth might be a function of their size already or their footprint or their users. And that would include everyone from Google to Amazon to meta that they end up being worth way more than anyone thought.”Bill Gurley
Principle
Venture is the only investing category with true network effects
In venture, reputation compounds into a self-reinforcing deal-flow advantage.
Gurley notes a successful VC's stamp of approval carries weight in itself, giving established investors an unfair edge in sourcing the best companies.
Invest in reputation early; it becomes a compounding sourcing moat.
“some people have said it's the only investing category where there are network effects, because once you have a reputation, it, it, it, you have an unfair advantage in deal flow”Bill Gurley
Principle
Think in whole systems — trace second- and third-derivative effects
Model the whole system and its downstream ripples, not one variable in isolation.
Gurley credits systems thinking (via the Santa Fe Institute and the book Thinking In Systems) as his core mental model: complex systems behave one way until a single variable flips, then diverge sharply, so decisions must account for first-, second-, and third-order consequences.
Before shipping a change, ask which other variables couple to it and over what lag.
“There's consequences that can be first, second, third derivative. And, You know, you, you can't just think with a linear model or just think one variable because things can, can go way off the path.”Bill Gurley
Principle
Master the bedrock first, then innovate on top of it
Build a firm foundation before innovating; the foundation tells you what to change.
Gurley's Wall Street grounding (Peter Lynch, Ben Graham, Buffett, Howard Marks) gave him a financial bedrock he then extended into network-effect-driven venture investing.
Ground yourself in the classics of your discipline before trying to break them.
“I think having a firm understanding of the bedrock is super valuable. And then when you recognize the need to innovate on top of it, it's just really good to have that foundation.”Bill Gurley
Principle
Wall Street is the buyer of what venture creates
Know what the eventual public-market buyer values and build toward it from day one.
Gurley argues many Silicon Valley VCs would benefit from stronger finance grounding precisely because the exit buyer — Wall Street — is the ultimate customer whose value criteria should shape early bets.
Learn what public markets reward and reverse-engineer toward it early.
“I've always thought of Wall Street as the buyer of the product that venture capitalists create. Mm. Because of the eventual liquidity is either an m and a or an IPO and now the price is being set by that group and that institution.”Bill Gurley
Principle
Obsessive learning on the moving edge is the entrepreneur's trait
The common trait of disruptive founders is obsessive, constant learning at the technology edge.
Gurley notes that when mobile arrived no engineers had written mobile apps; a few got on the edge and defined it — the same is now happening with AI.
Spend nights becoming top-1% current on the newest wave in your domain.
“every entrepreneur that's exploiting that, it's AI right now, they're, they're going home at night and reading everything they possibly can. 'cause the edge is moving and they need to be right there and they need to be a top one percentile person that understands this new thing that's happening.”Bill Gurley
Principle
Combine deep history with the bleeding edge to become a power player
Mastering both the history and the bleeding edge of your field makes you a power player.
Gurley's example: a marketing hire who knows the masters of marketing AND deeply gets TikTok is uniquely differentiated walking into P&G or Pepsi.
Pair mastery of the classics with fluency on the newest platform in your field.
“I'm suggesting you should understand the really old stuff, the history, because it's differentiating and shows a passion and it gives you a great frame of mind, but you also wanna really understand the new edge If you do both of those things. Like you're a, I think you're a power player in your field”Bill Gurley
Principle
Storytelling is a top-three founder trait
Storytelling is one of the three great unfair advantages a founder can have.
Gurley points to Bezos, Toby Lutke at Shopify, and Daniel Ek as gifted storytellers whose narrative skill lets the world follow them.
Treat narrative craft as a core executive skill, not a soft one.
“Someone asked me like the top three traits of founders that are successful and I put storytelling in there.”Bill Gurley
Principle
Know the bedrock history of your field — it is radically differentiating
Deep command of your field's history is a rare, high-contrast differentiator.
Gurley cites John Lasseter tying a 10-course meal to classic cartoons, Magnus Carlsen winning a chess-history trivia contest, and Picasso mastering realism by 14 — depth of history as the mark and signal of mastery.
Learn the canon of your field and surface it — it reads as passion and depth.
“I just think it would be like remarkably differentiating for people to walk around with the history of their field.”Bill Gurley
Principle
Trajectory matters more than the starting place
Judge an early company by where its trajectory ends, not where it starts.
Echoing Bill Miller, Gurley frames value as an asset being underpriced relative to future worth; even at two-people-in-a-PowerPoint you evaluate against what the eventual buyer will prize.
Ask what this looks like grown up and whether the exit buyer will want it.
“so if I know what they value, even if we're starting at a very early place, two people in a PowerPoint, you're still thinking about when this thing grows up, is it gonna be something they're excited about?”Bill Gurley