Conventional finance, also known as mainstream finance, represents the dominant paradigm for understanding and managing financial markets. Rooted in neoclassical economics, it provides the theoretical foundation for much of the practical work done in investment banking, asset management, and corporate finance.
At its core, conventional finance relies on several key assumptions. First, it posits that investors are rational. This means they act in their own self-interest to maximize expected utility or wealth, and they make decisions based on a thorough analysis of available information. They are assumed to be risk-averse, meaning they prefer less risk for a given level of return.
Second, conventional finance assumes that markets are efficient. This implies that asset prices fully reflect all available information. In an efficient market, it’s difficult, if not impossible, to consistently outperform the market average because any new information is immediately incorporated into prices. The efficient market hypothesis (EMH) exists in various forms, from weak (prices reflect past information) to semi-strong (prices reflect all publicly available information) to strong (prices reflect all information, including insider information).
Third, conventional finance emphasizes the importance of risk-return trade-off. Higher expected returns come with higher levels of risk. Investors demand compensation for taking on additional risk, and this compensation is reflected in asset prices. The Capital Asset Pricing Model (CAPM) is a cornerstone model used to quantify this relationship, providing a framework for estimating the required rate of return for an asset based on its systematic risk (beta).
These assumptions lead to several important implications for financial decision-making. Portfolio diversification is a key strategy for managing risk. By spreading investments across different asset classes, investors can reduce unsystematic risk (risk specific to individual companies or industries) without sacrificing returns. Modern Portfolio Theory (MPT) provides the mathematical framework for constructing efficient portfolios that offer the highest possible return for a given level of risk.
Furthermore, conventional finance stresses the importance of discounted cash flow (DCF) analysis for valuing assets. This method involves projecting future cash flows generated by an asset and discounting them back to their present value using an appropriate discount rate, which reflects the time value of money and the risk associated with the cash flows. DCF analysis is widely used in corporate finance to evaluate investment opportunities and in investment banking to value companies during mergers and acquisitions.
While conventional finance has been immensely influential, it’s important to acknowledge its limitations. Behavioral finance, a field that challenges the assumptions of rationality and market efficiency, has gained prominence in recent decades. Behavioral finance recognizes that investors are often influenced by psychological biases and emotions, leading to deviations from rational decision-making. This has spurred the development of alternative models that incorporate these behavioral factors to better explain market anomalies and investor behavior.
Despite its critiques, conventional finance remains a foundational framework for understanding financial markets. It provides a valuable set of tools and models for making informed investment decisions, managing risk, and valuing assets. Understanding the principles of conventional finance is essential for anyone working in the financial industry or seeking to make sound financial decisions.