Hidden Forces feed 2024年07月17日
Quantifying Uncertainty: A History of Financial Theory and its Implications | Daniel Peris
index_new5.html
../../../zaker_core/zaker_tpl_static/wap/tpl_guoji1.html

 

本期节目探讨了金融理论的演变,从19世纪不受监管、混乱的金融市场,到20世纪大萧条后出现的一套新的金融理论。节目分为两部分:第一部分回顾了1929年前的金融市场,第二部分则探究了大萧条后新兴的金融理论,以及这些理论如何影响了现代投资决策。

🤔 **从19世纪的“野蛮”金融到20世纪的现代金融理论:** 19世纪的金融市场充满了投机和操纵,市场缺乏监管,效率低下。20世纪大萧条后,经济、人口、制度和思想的变革促使人们寻求新的金融理论来解释市场行为,并指导投资决策。现代投资理论,如现代投资组合理论 (MPT)、有效市场假说 (EMH) 和资本资产定价模型 (CAPM) 等,应运而生。

📈 **现代投资理论的兴起与“风险-收益”的追求:** 现代投资理论的兴起与二战后不断增长的中产阶级和可投资资产有关。这些理论试图通过量化风险和收益来为投资决策提供依据,并为投资者提供了一种掌控市场的感觉。这种趋势也与 1974 年的《雇员退休收入保障法案》(ERISA) 密切相关,该法案鼓励退休基金采用更系统化的投资策略。

⚠️ **现代投资理论的局限性:** 现代投资理论基于“经济是一个独立现象”的假设,并试图将经济规律与自然科学规律类比,忽略了经济运行中的政治因素。例如,奥地利学派更注重自由市场环境下的银行体系运作,而现代货币理论 (MMT) 则更关注当前不受约束的信贷增长环境下的货币体系。这些理论的差异反映了不同的政治理念和社会理想。

🤔 **投资理论的应用与“控制”的幻想:** 在投资领域,利润是最终目标。现代投资理论的广泛采用,部分源于投资者对“控制”的渴望。这些理论提供了量化风险和收益的工具,让人们感觉能够掌控市场,但这可能导致人们忽略了市场本身的复杂性和不可预测性。

📊 **多元化与系统性风险:** 现代投资理论强调多元化,即通过投资不同资产来降低风险。然而,当所有人都采用多元化策略时,可能会导致系统性风险的增加。这意味着市场整体下跌的风险会更高,因为所有资产都受到相同因素的影响。

In Episode 73 of Hidden Forces, Demetri Kofinas speaks with Daniel Peris, a Senior Portfolio Manager at Federated Investors in Pittsburgh where he oversees the firm's dividend-focused products. He is the author of three books on investing, most recently: "Getting Back to Business: Why Modern Portfolio Theory Fails Investors, and How You Can Bring Common Sense to Your Portfolio." Before transitioning into asset management, Peris was a historian focused on modern Russian history. He is the author of a book and several articles on the Soviet Union in the 1920s and 1930s.

Today’s conversation is about the evolution of financial theory, beginning with the rough and tumble world of 19th century finance with its stock syndicates, market corners, and curb exchanges. Where big personalities like Daniel Drew, James Fisk, and Jay Gould conspired and fought to take from Joe Public, and from each other, the riches afforded to them by laissez-faire capitalism and the industrial revolution.

The discussion is broken into two parts. The first deals with the world as it was before 1929 with its unregulated, unstructured, and highly inefficient markets. The second part explores the world after the Great Crash, where a confluence of forces – economic, demographic, institutional, and intellectual – supported the procurement and distribution of a new set of financial theories that promised to explain away uncertainty and guide the allocation of risk in the pursuit of profits.

As inheritors of this new world, we cannot help but function under the fallacies of its paradigms. One of these fallacies is the notion that economies are independent phenomena that operate, by and large, according to a certain set of physical laws. Most people will acknowledge that our economic and financial models are imperfect, but most people also think of them as being somewhat analogous to models developed in the natural sciences. Because of this false comparison to physics (equilibrium) and nature (normal distributions), people often remain unaware of the centrality of politics in theories of the economy. Economies are not independent phenomena that answer only to the laws of nature. They are political and social phenomena that exist within a political system. Theories of the economy that do not take into account the system within which they operate are flawed...in some cases, significantly so.

Austrian theories of money and credit, for example, are better at describing how the banking system operates in a laissez-faire society, whereas Modern Monetary Theory is better at describing how it works in our current, fiat-based system of unrestrained credit growth. What often happens is that devotees of these different schools are actually advocating for a specific set of policies, under the pretense that their views are scientific and that their policies derive logically from some objective view of how an ideal economy operates, when in fact, they are based on political values and societal ideals. The MMT school is full of progressive social-democrats who want governments to play a larger role in the economy, whereas the Austrian school is full of conservative libertarians who want less government. This sorting along political lines is not a coincidence. Investment theories operate rather differently than theories about the economy, in that there is no argument in the investment world about what matters most. It’s profits.

In light of this fact, the discrepancies between various investment theories require alternative explanations that do not rely on political ideology or moral sentiment. It would seem sufficient to declare that the widespread adoption of theories like Modern Portfolio Theory (MPT), the Efficient Market Hypothesis (EMH), Capital Asset Pricing Model (CAPM), etc., was enabled by the growth of a large middle class with excess income available for investment that had not directly experienced the boom and bust of the Roaring 20’s and accelerated by the Employee Retirement Income Security Act (ERISA) of 1974. Entrepreneurially minded financial industry professionals saw an opportunity, but this opportunity required a more streamlined approach to investing and one that would put themselves, and their clients, at ease.

The need to bring order to the chaotic world of prices has encouraged the adoptions of systematic investment strategies that claimed the ability to quantify risk. When it comes to investing other people’s money, having a more coherent, easy-to-understand theory that provides the illusion of control is a very valuable tool. From an evolutionary point of view, it is no wonder how theories purporting to quantify risk and target reward proliferated so quickly. It was in everyone’s interest that they do so.

How these theories came together to form the dominant, ideological template of risk-adjusted-return measured against exposure to the broader market is the essence of today’s episode. Its significance can be found in the implications associated with equating diversification with correlation: trading idiosyncratic risk for systemic risk and what happens when everyone is doing it.

Producer & Host: Demetri Kofinas

Editor & Engineer: Stylianos Nicolaou

Join the conversation on Facebook, Instagram, and Twitter at @hiddenforcespod

Fish AI Reader

Fish AI Reader

AI辅助创作,多种专业模板,深度分析,高质量内容生成。从观点提取到深度思考,FishAI为您提供全方位的创作支持。新版本引入自定义参数,让您的创作更加个性化和精准。

FishAI

FishAI

鱼阅,AI 时代的下一个智能信息助手,助你摆脱信息焦虑

联系邮箱 441953276@qq.com

相关标签

金融理论 投资理论 现代投资组合理论 有效市场假说 资本资产定价模型
相关文章