Most winning businesses position themselves inside the flow of value, taking a slice as money moves through their networks. Blockchains turn this model into a default: every transaction adds to a shared, programmable ledger that benefits users, builders, validators and token holders alike. Instead of building network effects from scratch atop old rails, crypto startups inherit them from day one. Stablecoins and smart contracts let dollars clear instantly, around the clock, worldwide—and give founders public unit economics and direct access to every dollar in motion. History offers parallels. Railroads profited by hauling commodities, not by manufacturing locomotives. Standard Oil, U.S. Steel and AT&T all sat in chokepoints where value passed. Google and Meta grabbed trillions by converting attention into commerce. Financial markets sharpen the point: Visa handled $15.7 trillion in payments last year and earned $35.9 billion in net revenue; top U.S. market makers posted more trading revenue than Citigroup or Bank of America by simply matching orders. More flow means more revenue, while each new participant tightens spreads and draws in extra volume. Jeff Bezos nailed it with “Your margin is my opportunity.” In finance, interchange fees, custody charges, FX spreads and overnight settlement taxes leave huge slices on the table. Stripe and Square showed how quickly margins shrink when you speed up rails and cut costs. Crypto enables far bigger jumps: programmable, instant, global money movement can undercut incumbents across payments, lending, settlement—or even new arenas like GPU marketplaces, energy trading or AI data markets—anywhere existing systems bottleneck value. Founders should ask where, in their market, margins stand far above the value created—and then build a product that re-routes that flow through programmable rails. When your network scales tenfold, your revenue should too. That setup—money flow plus network effects—remains one of the most robust business designs ever.