What market efficiency does not imply:

Efficient Market Hypothesis (EMH)

The Efficient Markets Hypothesis - ThoughtCo

The fundamental causes of particular recessions as a practical matter always include government policies that negatively affect the economy and that are not self-liquidating during market contractions. There are a variety of incentives - many of which flow from government policies - that undermine market stability. Whatever the theoretical strengths of the Efficient Market Hypothesis, it is of limited applicability to a modern U.S. market system that is heavily distorted by government policies. Moreover, as Cooper notes, the Efficient Market Hypothesis is repeatedly refuted by the ongoing business cycle.

The efficient-market hypothesis ..

Accounting Theory | Efficient Market Hypothesis | Theory

The study also examines the differences in the stock price reaction to unexpected quarterly earnings announcements based on the firm size, measured through the market value of firm’s equity (market capitalization).

Agenda
Introduction

Objectives of the Study

Data and Methodology

Empirical Findings

Conclusion

Following the efficient market hypothesis, the stock prices should adjust instantaneously to the information concerning security valuations that are contained in the earnings announcements…
At least one-half of all the information about a firm which becomes available during a year is captured in that year’s accounting numbers.

Efficient markets hypothesis - Wikinvest

The intuition behind the efficient markets hypothesis is pretty straightforward- if the market price of a stock or bond was lower than what available information would suggest it should be, investors could (and would) profit (generally via ) by buying the asset. This increase in demand, however, would push up the price of the asset until it was no longer "underpriced." Conversely, if the market price of a stock or bond was higher than what available information would suggest it should be, investors could (and would) profit by selling the asset (either selling the asset outright or short selling an asset that they don't own). In this case, the increase in the supply of the asset would push down the price of the asset until it was no longer "overpriced." In either case, the profit motive of investors in these markets would lead to "correct" pricing of assets and no consistent opportunities for excess profit left on the table.

The Efficient-Market Hypothesis (EMH) is a popular theory within the world of finance


The Efficient Market Hypothesis - Gresham College

The second form, known as the semi-strong form (or semi-strong efficiency), suggests that stock prices react almost immediately to any new public information about an asset. In addition, the semi-strong form of the efficient markets hypothesis claims that markets don't overreact or underreact to new information.

The Efficient Markets Hypothesis

The empirical evidence for the efficient markets hypothesis is somewhat mixed, though the strong-form hypothesis has pretty consistently been refuted. In particular, researchers aim to document ways in which financial markets are inefficient and situations in which asset prices are at least partially predictable.

What is the Efficient Market Hypothesis? - Tastytrade

In addition, behavioral finance researchers challenge the efficient markets hypothesis on theoretical grounds by documenting both cognitive biases that drive investors' behavior away from rationality and limits to that prevent others from taking advantage of the cognitive biases (and, by doing so, keeping markets efficient).

efficient market hypothesis - Investopedia

In the backdrop of this, the case study is helpful to test and analyze whether the behavior of the Indian stock market supported Weak, Semi-Strong, or Strong form of Efficient Market Hypothesis.

Efficient-market hypothesis - WikiVisually

(a) In an efficient market, equity research and valuation would be a costly task that provided no benefits. The odds of finding an undervalued stock should be random (50/50). At best, the benefits from information collection and equity research would cover the costs of doing the research.