High-margin software businesses operate on 'easy mode,' which can mask inefficiencies. To build a truly durable company, founders should study discount retailers like Costco or Aldi. These businesses thrive on razor-thin margins by mastering cost reduction, operational simplicity, and value delivery—lessons directly applicable to building efficient software companies.

High margins create stability but also invite competition. The ideal strategy is to operate with margins low enough to build customer loyalty and a competitive moat, while retaining the *ability* to raise prices when necessary. This balances long-term growth with short-term financial resilience.

Costco is suing the Trump administration over tariffs, not just as a legal strategy, but as a public relations move. It signals to customers that Costco will fight anyone, even the president, to uphold its core value proposition of saving people money.

A sustainable competitive advantage is often rooted in a company's culture. When core values are directly aligned with what gives a company its market edge (e.g., Costco's employee focus driving superior retail service), the moat becomes incredibly difficult for competitors to replicate.

Costco's success stems from its radically limited selection (~4,000 SKUs). This deliberate constraint creates a powerful flywheel: it makes them a critical partner for every vendor, enables deep product expertise for buyers, and drives rapid inventory turnover, resulting in a negative cash conversion cycle.

Costco's business model is unique: it aims to break even on merchandise sales. This allows it to offer the lowest possible prices, building immense customer loyalty. The company's entire operating profit is derived from its annual membership fees, which represent only 2% of total revenue.

Unlike most retailers who take cost savings as margin, Costco passes all efficiency gains to the customer. This continuously widens its value proposition and competitive advantage, making it nearly impossible for rivals to match its prices and value.

Businesses can build a moat by either manufacturing scarcity to create exclusivity and pricing power (like Hermes) or by systematically eliminating it to offer unbeatable prices and volume (like Costco). Both are deliberate strategic choices that leverage the same economic principle in opposite ways.

Charlie Munger prized 'win-win' systems, and Costco is the prime example. By offering clear value to all stakeholders—low prices for customers, reliable partnership for suppliers, high wages for employees, and steady returns for investors—Costco creates a self-reinforcing, durable competitive advantage that is difficult to replicate.