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First Principles Thinking

第一性原理思考

Framework

框架

IRON LAW: Assumptions Are Not Facts

Most "constraints" are assumed, not physical. "We can't do X" usually means
"We haven't seen anyone do X" or "The current method doesn't allow X."
First principles thinking distinguishes between:
- Physical laws (actual constraints: gravity, thermodynamics)
- Conventions (assumed constraints: "this is how it's done")
IRON LAW: Assumptions Are Not Facts

Most "constraints" are assumed, not physical. "We can't do X" usually means
"We haven't seen anyone do X" or "The current method doesn't allow X."
First principles thinking distinguishes between:
- Physical laws (actual constraints: gravity, thermodynamics)
- Conventions (assumed constraints: "this is how it's done")

The Method

方法

1. Identify the assumption: What do "everyone knows" or "everyone does"?
2. Break it down to fundamentals: What are the basic, irreducible facts?
  • Techniques: "Five Whys" (ask why 5 times), cost decomposition, physics-level analysis
3. Reason up from fundamentals: Given only the base facts, what's the best solution?
1. 识别假设：“大家都知道”或“大家都这么做”的内容是什么？
2. 拆解为基本事实：最基础、不可再分的事实是什么？
  • 技巧：“五问法”（连续问5个为什么）、成本分解、物理层面分析
3. 从基本事实出发推理：仅基于基础事实，最优解是什么？

Example: Elon Musk on Battery Costs (2010s)

示例：2010年代埃隆·马斯克谈电池成本

  • Convention: "Batteries cost $600/kWh. Electric cars will always be too expensive."
  • First principles: What are batteries made of? Cobalt, nickel, lithium, carbon, metals, polymers. What do these raw materials cost? ~$80/kWh at commodity prices.
  • Reasoning up: If we buy materials and build batteries ourselves, we can potentially reduce costs to near $80/kWh. The $520 gap is manufacturing inefficiency and supply chain markup, not physics.
  • 常规观点：“电池成本为600美元/千瓦时，电动汽车永远会太贵。”
  • 第一性原理：电池由什么构成？钴、镍、锂、碳、金属、聚合物。这些原材料的成本是多少？按大宗商品价格计算约为80美元/千瓦时。
  • 推理过程：如果我们自行采购原材料并制造电池，理论上可以将成本降至接近80美元/千瓦时。520美元的差价来自制造低效和供应链加价，而非物理限制。

Five Whys for Assumption Drilling

用于深挖假设的五问法

  1. "Why is our product priced at $100?" — Because our COGS is $60 and we need 40% margin.
  2. "Why is COGS $60?" — Because we use supplier X for component Y.
  3. "Why do we use supplier X?" — Because we've always used them.
  4. "Why haven't we looked at alternatives?" — Because the procurement team hasn't been asked to.
  5. "Why not?" — There's no real reason. It's just convention.
→ Fundamental constraint found: the COGS includes an unexamined supplier relationship, not a physical constraint.
  1. “为什么我们的产品定价100美元？”——因为我们的销货成本（COGS）是60美元，需要40%的利润率。
  2. “为什么销货成本是60美元？”——因为我们使用供应商X提供组件Y。
  3. “为什么我们选择供应商X？”——因为我们一直和他们合作。
  4. “为什么我们没考虑过替代方案？”——因为没人要求采购团队这么做。
  5. “为什么不要求？”——没有真正的理由，只是常规惯例而已。
→ 找到的核心限制：销货成本包含未被审视的供应商合作关系，而非物理限制。

Cost Decomposition Template

成本分解模板

For any "it costs too much" problem:
  1. List every cost component
  2. For each, identify: Is this cost from physics (materials, energy) or from convention (markup, inefficiency, legacy process)?
  3. Question every convention-based cost
针对任何“成本过高”的问题：
  1. 列出所有成本构成部分
  2. 针对每一项，判断：该成本来自物理因素（材料、能源）还是常规惯例（加价、低效、遗留流程）？
  3. 质疑所有基于常规惯例的成本

Output Format

输出格式

markdown
undefined
markdown
undefined

First Principles Analysis: {Problem}

First Principles Analysis: {Problem}

The Assumption

The Assumption

{What "everyone knows" or the conventional constraint}
{What "everyone knows" or the conventional constraint}

Decomposition

Decomposition

ComponentCost/FactPhysics or Convention?
{element}{value}Physics / Convention
ComponentCost/FactPhysics or Convention?
{element}{value}Physics / Convention

Fundamental Truths

Fundamental Truths

{What remains after stripping away assumptions}
{What remains after stripping away assumptions}

Reasoning Up

Reasoning Up

{Given only fundamental truths, what's the best approach?}
{Given only fundamental truths, what's the best approach?}

Proposed Solution

Proposed Solution

{What changes if we ignore conventions and reason from fundamentals}
undefined
{What changes if we ignore conventions and reason from fundamentals}
undefined

Gotchas

注意事项

  • Don't reinvent the wheel for everything: First principles is expensive (time, effort). Use it for high-stakes problems where conventional approaches clearly fail. For routine decisions, best practices and heuristics are fine.
  • Physics constraints are real: Don't confuse first principles thinking with ignoring physical reality. You can't reason your way past thermodynamics.
  • "Convention" has value: Conventions encode collective experience. Dismissing all conventions as "assumptions" is arrogance, not first principles thinking. The point is to EXAMINE conventions, not automatically reject them.
  • Execution matters: A first-principles insight is worthless without execution capability. SpaceX didn't just THINK about cheap rockets — they BUILT a vertically integrated manufacturing operation.
  • 不要凡事都从零开始：第一性原理思考成本很高（时间、精力）。仅在常规方法明显失效的高风险问题上使用它。对于日常决策，最佳实践和启发式方法就足够了。
  • 物理限制是真实存在的：不要将第一性原理思考与无视物理现实混为一谈。你无法通过推理突破热力学定律。
  • “常规惯例”有其价值：常规惯例凝聚了集体经验。将所有常规惯例都视为“假设”而摒弃是傲慢，而非第一性原理思考。关键是审视常规惯例，而非自动拒绝。
  • 执行至关重要：没有执行能力，第一性原理的洞见毫无价值。SpaceX不只是想到了廉价火箭——他们还建立了垂直整合的制造运营体系。

References

参考文献

  • For Socratic questioning method (complementary), see the hum-socratic skill
  • 关于苏格拉底提问法（互补方法），可查看hum-socratic技能