第一章 认识论陷阱：全知理性与信息不可知性
作者：张兴贵
第一章 第二节 “全知规划者”的幻觉：中央计划经济的信息困境
在共产主义的经济图景中，私有制与市场竞争被视为混乱、无序与浪费的根源（即所谓的“生产无政府状态”）。为了消除这种无序，共产主义主张建立高度集中的中央计划经济，由国家统一收集全社会的资源、需求与生产能力信息，然后制定出一套涵盖所有经济活动的宏大计划。
然而，这套构想建立在一个隐性的、却极其脆弱的认识论假设之上：存在一个“全知”的中央规划者。
一、信息海啸
在真实的经济生活中，一个中等规模的现代国家每天产生的经济行为与交易信息是无与伦比的。从一粒纽扣的生产成本，到千家万户对某种食品的实时偏好；从某家工厂机器零部件的磨损程度，到下一个季节服装样式的流行趋势……这些信息的数量以海量计算。
中央计划经济试图将这些庞杂的信息全部上传至一个顶层决策机构（如国家计划委员会），再由该机构计算出每种产品的生产数量、原材料分配额度以及出厂价格。在现实运行中，这种模式立刻遭遇了信息处理能力的物理极限：
信息的失真与延迟：信息在自下而上的层层上报过程中，必然遭遇极其严重的时效滞后与人为篡改。基层的生产单位为了争取更多的资源、降低自己的考核指标，有强烈的动机虚报需求、隐瞒产能。
计划的僵化与脱节：当中央计划委员会耗费数月甚至数年时间制定出包含上百万种商品的“五年计划”时，市场实际的需求、技术条件与自然环境早就发生了巨大的变化。计划永远赶不上变化，导致“计划赶不上变化”的讽刺现实。
二、假定“数据已知”的逻辑谬误
西方主流经济学在建立数学模型时，往往会假定“已知供给函数与需求函数，求解均衡价格”。许多早期主张计划经济的学者（如奥斯卡·兰格）据此认为，只要拥有足够强大的算力（如现代计算机），中央计划部门就能联立解出成千上万个方程式，从而实现比市场更高效的资源配置。然而，这种观点的致命漏洞在于：它把经济学数学模型中的“假定已知”，错当成了现实生活中的“实际已知”。
在现实的市场中，根本不存在任何现成的“供给函数”或“需求函数”等待计划部门去收集。消费者自己往往都不清楚自己在三个月后具体需要买什么、愿意为此支付多少价格，直到他站在商品面前做出选择的那一刻；生产者也不知道某种新产品能否成功，直到它投入市场接受检验。
这些数据只有在市场交易的动态过程中才会产生。中央计划经济试图在没有市场交易的前提下事先收集这些数据，无异于缘木求鱼。
三、结构性信息屏蔽与反馈机制缺失
在一个自由市场体系中，信息是通过价格波动和盈亏信号进行实时纠偏的。如果某种商品短缺，价格上涨，利润增加，就会立刻吸引资本和劳动力进入，短缺随之缓解；反之亦然。这是一种自下而上、高频、敏感的反馈回路。而在中央计划体制下，由于取消了自由价格与市场竞争：
纠偏机制完全依赖自上而下的行政命令。
计划部门无法获知某种商品究竟是真正过剩还是假性过剩，是需求不足还是分配不均。
错误无法被及时识别，甚至会被政治意志不断放大，直到演变成全社会范围内的商品大匮乏或严重的资源浪费（例如，一边是重工业钢材的极大过剩，一边是轻工业日用品的极度匮乏）。
第一章第三节 哈耶克知识问题：分散知识、隐性知识与价格机制
对共产主义认识论缺陷最致命的解构，来自于奥地利经济学派代表人物、1974年诺贝尔经济学奖得主弗里德里希·哈耶克。在1945年发表的划时代论文《社会中知识的利用》中，哈耶克彻底颠覆了人们对“知识”和“信息”的传统概念，给中央计划经济贴上了认识论上的死亡标签。
一、知识的两种形态：科学知识与“特定时空知识”
传统观念（特别是共产主义的理性主义者）认为，所谓的“知识”就是指那些可以被公式化、文字化、统计化的科学定律、技术数据和生产指标。如果知识仅仅是这些，那么理论上将它们集中到一个中央数据库中确实是可行的。
但哈耶克指出，对社会经济运行起着决定性作用的，往往是另一种形态的知识——“特定时间和地点之具体情况的知识”，亦可称为分散知识或隐性知识。
这类知识包括：一个机器操作工对某台旧机器特定脾气和磨损状况的直觉掌控；一个季节性商人对当地突发天气变化引发的特定商品需求的敏锐察觉；一个物流调度员对某条道路临时拥堵所掌握的避让路线；每一个普通消费者在特定时刻对某种商品的边际偏好。
这类知识具有极其鲜明的特征：
高度分散性：它零散地分布在数以亿计的社会个体头脑中，没有任何一个人能够掌握其全貌。
不可文字化与不可统计性：许多隐性知识甚至连拥有者自己都无法用语言精准表达（如“我知道怎么骑自行车，但我无法用物理公式向你解释我如何保持平衡”），因而根本无法填入行政统计表格中上报给计划部门。
瞬息万变性：这类知识随着时空条件的变化而随时生灭，具有极强的时效性。
二、价格机制的本质：一种分散信息的通信系统
如果社会所需要的知识是高度分散、不可集中且随时变化的，那么一个庞大的社会究竟是如何实现协调运转的？
哈耶克的答案是：自由市场中的价格机制。
价格绝不仅仅是买卖商品时付出的货币数量，在本质上，价格是一个极其巧妙的信息压缩与传播系统。例如，假定世界上某个地方突然发现了一种新的锡矿开采技术，或者某个主要锡矿发生了塌方导致产量剧减。对于一个远在万里之外的罐头制造商来说，他完全不需要知道锡的产地究竟发生了什么政治、自然或技术变动，他也不需要去读计划部门下发的文件。他只需要看到一件事：市场上锡的价格上涨了。
这个上涨的价格信号，立刻将庞大复杂的全球供求变化信息，浓缩为一个简单的数字变动，并向全球所有的相关经营者传递了一个指令：节约用锡，或者寻找替代品。
在自由市场中，没有哪个人在扮演“指挥官”，也没有任何中央计划机构在下达命令。价格机制通过自发形成的信号网络，协调了全球数以亿计互相不认识的个体的行动，使得全社会的资源得到了高度精准且迅速的重新配置。
三、共产主义对价格机制的摧毁
共产主义体制强行废除了私有产权与自由交易，取消了真正的市场价格，转而由国家计划部门统一进行行政定价。
这一举动在认识论层面造成了灾难性的后果：它直接切断了社会上唯一能够高效传递分散知识的信息网络。
当价格不再由自由供求关系决定，而是由计划官员凭空制定时：
价格就彻底失去了表达稀缺程度与个人偏好的功能。
价格变成了一串毫无意味的行政数字，无法指示资源的真实价值。
整个社会陷入了“信息的黑暗时代”。
计划部门官员面对的是一个失去了价格参照系的经济黑洞。他们不知道应该生产100万双鞋子还是1000万双鞋子，不知道应该把钢材分配给农机厂还是汽车厂。因为缺乏价格信号，任何资源分配的决策都变成了盲目的拍脑袋和政治博弈。
编辑：钟然 校对：孔祥庆 翻译：吕峰
Why Communism Is Structurally Unachievable
Chapter One — The Epistemological Trap: Omniscient Reason and the Limits of Knowability
Author: Zhang Xinggui
Abstract: Centrally planned economies struggle to obtain and use society’s dispersed and constantly changing information. Without effective price signals and feedback mechanisms, they are prone to resource misallocation, mistaken decisions, and economic imbalances, revealing structural difficulties in information processing and resource allocation.
Chapter One, Section Two — The Illusion of the “Omniscient Planner”: The Information Dilemma of Central Planning
In the communist economic vision, private ownership and market competition are regarded as sources of chaos, disorder, and waste—the so-called “anarchy of production.” To eliminate this disorder, communism advocates a highly centralized planned economy in which the state gathers information about society’s resources, needs, and productive capacity, then formulates a comprehensive plan covering all economic activity.
This conception, however, rests on an implicit yet profoundly fragile epistemological assumption: the existence of an “omniscient” central planner.
I. An Information Tsunami
In actual economic life, even a medium-sized modern country generates an immense volume of information about economic activities and transactions every day. From the production cost of a single button to households’ changing preferences for particular foods; from wear on a factory machine’s components to next season’s fashion trends—the volume of information is staggering.
Central planning attempts to transmit all this complex information to a top-level decision-making body, such as a state planning commission, which then calculates production quantities, raw-material allocations, and factory-gate prices for every product. In practice, this model immediately encounters the physical limits of information-processing capacity:
Information distortion and delay: As information moves upward through successive administrative layers, it inevitably suffers serious delays and deliberate manipulation. Production units have strong incentives to exaggerate their resource requirements and conceal their productive capacity in order to secure more resources and obtain less demanding performance targets.
Rigid plans disconnected from reality: By the time a central planning commission has spent months or even years drafting a five-year plan covering millions of products, actual demand, technological conditions, and the natural environment have already changed substantially. Plans perpetually lag behind events, giving rise to the familiar irony that “plans cannot keep pace with change.”
II. The Logical Fallacy of Assuming That the Data Are Known
When constructing mathematical models, mainstream Western economics often begins with an assumption such as: “Given the supply and demand functions, solve for the equilibrium price.” Drawing on this framework, some early advocates of planned economies, such as Oskar Lange, believed that sufficient computing power—such as that provided by modern computers—would allow central planning authorities to solve thousands of simultaneous equations and allocate resources more efficiently than markets.
The fatal flaw in this reasoning, however, is that it mistakes what is “assumed to be known” within a mathematical model for what is “actually known” in the real world.
In real markets, there are no ready-made “supply functions” or “demand functions” waiting to be collected by planning authorities. Consumers themselves often do not know exactly what they will want to buy three months from now, or how much they will be willing to pay, until they encounter a product and make a choice. Producers likewise do not know whether a new product will succeed until it enters the market and is put to the test.
These data emerge only through the dynamic process of market exchange. Attempting to collect them in advance while dispensing with market transactions is like climbing a tree to catch fish.
III. Structural Barriers to Information and the Absence of Feedback Mechanisms
In a free-market system, price movements and profit-and-loss signals provide continuous feedback and correction. If a product becomes scarce, its price rises and profits increase, attracting capital and labor into its production and thereby alleviating the shortage. The reverse also applies. This is a bottom-up, high-frequency, responsive feedback loop.
Under central planning, however, the abolition of freely determined prices and market competition means that:
Corrective action depends entirely on top-down administrative orders.
Planning authorities cannot determine whether an apparent surplus reflects genuine overproduction or merely distribution problems, or whether weak sales result from insufficient demand or uneven allocation.
Errors cannot be identified promptly and may even be amplified by political directives until they develop into society-wide shortages or severe resource waste—for example, a vast surplus of steel for heavy industry alongside an acute shortage of everyday consumer goods.
Chapter One, Section Three — Hayek’s Knowledge Problem: Dispersed Knowledge, Tacit Knowledge, and the Price Mechanism
One of the most devastating critiques of communism’s epistemological shortcomings came from Friedrich Hayek, a leading figure of the Austrian School of economics and a recipient of the 1974 Nobel Memorial Prize in Economic Sciences. In his landmark 1945 essay, “The Use of Knowledge in Society,” Hayek radically challenged conventional understandings of knowledge and information, delivering an epistemological death sentence to central planning.
I. Two Forms of Knowledge: Scientific Knowledge and Knowledge of Particular Circumstances of Time and Place
The conventional view—particularly among communist rationalists—holds that “knowledge” consists of scientific laws, technical data, and production indicators that can be expressed in formulas, recorded in writing, and captured statistically. If knowledge consisted only of these things, concentrating it in a central database would indeed be theoretically possible.
Hayek argued, however, that another kind of knowledge often plays a decisive role in economic life: “knowledge of the particular circumstances of time and place.” This may also be described as dispersed or tacit knowledge.
Examples include a machine operator’s intuitive understanding of an old machine’s peculiarities and wear; a seasonal trader’s sensitivity to sudden changes in local weather that generate demand for particular goods; a logistics dispatcher’s knowledge of alternative routes around temporary congestion; and an ordinary consumer’s marginal preferences at a particular moment.
This knowledge has several distinctive characteristics:
Highly dispersed: It is scattered across the minds of hundreds of millions of individuals. No single person can grasp it in its entirety.
Not fully articulable or statistically recordable: Much tacit knowledge cannot be precisely expressed in language even by the person who possesses it—as in, “I know how to ride a bicycle, but I cannot explain in physical equations how I maintain my balance.” It therefore cannot simply be entered into administrative reporting forms and submitted to planning authorities.
Constantly changing: Such knowledge emerges and disappears as circumstances change across time and place, making it highly time-sensitive.
II. The Essence of the Price Mechanism: A Communication System for Dispersed Information
If the knowledge needed by society is dispersed, resistant to centralization, and constantly changing, how can a large society coordinate its activities?
Hayek’s answer is the price mechanism of the free market.
Prices are far more than the amounts of money paid for goods. At their core, they constitute an extraordinarily ingenious system for compressing and transmitting information.
Suppose, for example, that somewhere in the world a new tin-mining technology is discovered, or that a collapse at a major tin mine sharply reduces output. A can manufacturer thousands of miles away does not need to know precisely what political, natural, or technological developments have occurred at the source. Nor does the manufacturer need to read documents issued by a planning authority. The manufacturer needs to observe only one thing: the market price of tin has risen.
That rising price immediately condenses a vast and complex set of changes in global supply and demand into a simple numerical movement. It communicates an instruction to all relevant businesses around the world: economize on tin or find substitutes.
In a free market, no individual acts as the “commander,” and no central planning agency issues orders. Through a spontaneously formed network of signals, the price mechanism coordinates the actions of hundreds of millions of people who do not know one another, enabling resources throughout society to be reallocated with considerable precision and speed.
III. Communism’s Destruction of the Price Mechanism
Communist systems forcibly abolish private property and free exchange, eliminating genuine market prices and replacing them with administrative prices set by state planning authorities.
At the epistemological level, this has disastrous consequences: it severs the only information network capable of efficiently transmitting dispersed knowledge throughout society.
When prices cease to be determined by freely operating supply and demand and are instead arbitrarily set by planning officials:
They lose their ability to express scarcity and individual preferences.
They become meaningless administrative numbers that cannot indicate the true value of resources.
Society as a whole enters an “information dark age.”
Planning officials confront an economic black hole without a price-based frame of reference. They do not know whether to produce one million pairs of shoes or ten million, or whether to allocate steel to agricultural machinery factories or automobile factories. Without price signals, every resource-allocation decision becomes a matter of arbitrary judgment and political bargaining.
Editor: Zhong RanProofreader: Kong XiangqingTranslator: Lyu Feng
