How the Stock Market Works: Answers to the Most Common Questions

How the Stock Market Works: Answers to the Most Common Questions

Benjamin Graham's framework for evaluating how the stock market works remains relevant decades after he first published it. Modern data confirms why.

Key Takeaways

• Understanding how the stock market works gives you a measurable edge in stock selection and portfolio allocation.
• Key metrics like pe ratio and pb ratio provide quantitative frameworks for evaluating this topic.
• Real examples from companies like Apple (P/E 28.3) and Berkshire Hathaway (P/E 9.8) illustrate practical applications.
• ValueMarkers' screener with 120+ indicators across 73 exchanges simplifies the analysis process.

The Most Common Questions About How The Stock Market Works

Investors regularly ask about how the stock market works, and the answers often involve specific metrics and data points. Below, we address the top questions with real numbers from companies like Apple, Microsoft, and Berkshire Hathaway.

What Makes How The Stock Market Works Important?

The short answer: it directly affects your risk-adjusted returns. The long answer involves understanding how metrics like pe ratio and pb ratio interact with market conditions.

When Apple trades at a P/E of 28.3 and JPMorgan at 11.2, the difference is not random. It reflects earnings growth expectations, capital allocation strategies, and sector-specific risk premiums. Understanding how the stock market works helps you interpret those differences.

How Does How The Stock Market Works Affect Stock Selection?

The data above shows how different stocks score across multiple dimensions. ValueMarkers' screener lets you filter across 120+ indicators on 73 global exchanges, making it practical to apply how the stock market works to real investment decisions.

What Metrics Should You Track?

Track pe ratio, pb ratio, and dividend yield. These three metrics cover valuation, efficiency, and risk. The ValueMarkers glossary explains each one with formulas and interpretation guides.

Visa's Piotroski Score of 8 and ROIC of 32.4% make it a quality standout. Coca-Cola's 3.0% dividend yield and Piotroski Score of 6 place it in the income-focused category. Matching your goals to the right metrics is the first step.

Valuation Metrics and Forward Returns

The relationship between valuation metrics and forward returns has been studied extensively across multiple decades of market data. Research consistently shows that stocks in the lowest P/E quintile outperform the highest quintile by approximately 4.7% annually over 20-year rolling periods. This finding reinforces why systematic screening matters for anyone evaluating how the stock market works. Apple's P/E of 28.3 sits in the upper quintile for the broader market, though it falls near the median for the technology sector. Context determines whether a given P/E represents opportunity or risk. JPMorgan's 11.2 P/E places it firmly in the value camp, and its ROIC of 14.1% confirms that the discount is not a reflection of deteriorating quality. The ValueMarkers screener quantifies these relationships across 73 exchanges simultaneously.

Diversification and Portfolio Construction

Diversification across sectors reduces portfolio volatility without significantly reducing expected returns. A portfolio holding financials (JPM, P/E 11.2), healthcare (JNJ, P/E 15.4), consumer staples (KO, P/E 23.7), and technology (AAPL, P/E 28.3) captures different economic drivers while maintaining quality standards. Academic research on portfolio theory confirms that holding 15-25 uncorrelated positions captures roughly 90% of the available diversification benefit. Adding positions beyond that point produces diminishing returns in risk reduction. For investors focused on how the stock market works, this means building a concentrated but diversified watchlist using the ValueMarkers screener rather than owning hundreds of stocks with marginal analytical conviction. The VMCI Score helps rank those 15-25 positions by composite quality.

The Role of the VMCI Score

The VMCI Score methodology at ValueMarkers assigns the highest weight to Value (35%) because decades of academic evidence link undervaluation to excess returns. Quality receives 30% because companies with high ROIC sustain their competitive advantages longer. Integrity at 15% flags potential accounting issues before they become headline news. Growth receives 12% weight because fast-growing companies that meet value and quality criteria represent rare opportunities. Risk at 8% accounts for balance sheet strength and volatility, providing a floor of safety for each position. This five-pillar framework directly applies to how you evaluate how the stock market works. A stock scoring in the top decile across all five pillars has historically outperformed the S&P 500 by 3-5% annually after transaction costs.

Behavioral Biases and Systematic Analysis

The behavioral finance literature documents several biases that affect investment decisions related to how the stock market works. Anchoring bias causes investors to fixate on purchase prices rather than current fundamentals. Confirmation bias leads to selective data gathering that supports pre-existing views. Recency bias overweights the last quarter of performance at the expense of the longer trend. A rules-based screening process, like the one available on ValueMarkers, counteracts all three of these tendencies. By defining your criteria in advance (P/E below 20, ROIC above 12%, Piotroski Score above 6), you remove the emotional component from the initial stock selection. The data either meets your standards or it does not. This discipline separates consistently profitable investors from those who chase performance.

Free Cash Flow and Intrinsic Value

Free cash flow yield offers a practical alternative to P/E for evaluating stocks in the context of how the stock market works. It equals free cash flow per share divided by the stock price. Companies with high free cash flow yields (above 5%) and high ROIC (above 15%) represent the sweet spot for value investors. Apple generates approximately $110 billion in annual free cash flow, which funds its massive buyback program and growing dividend. Coca-Cola's free cash flow of roughly $9 billion supports its 3.0% dividend yield with a comfortable coverage ratio. The ValueMarkers screener calculates FCF yield automatically, and the DCF calculator uses projected free cash flows to estimate intrinsic value. When the market price sits 20% or more below that estimate, you have a margin of safety.

Corporate Governance and the Integrity Pillar

Corporate governance quality directly affects long-term shareholder value. Companies with independent boards, properly aligned executive compensation, and transparent financial reporting tend to outperform over 5-10 year periods. The Integrity pillar of the VMCI Score captures these governance factors, adding a dimension that pure financial analysis misses when evaluating how the stock market works. Red flags include excessive related-party transactions, aggressive revenue recognition policies, and management compensation structures that reward short-term metrics at the expense of long-term value creation. Microsoft's consistently high Integrity score reflects its transparent reporting, independent audit committee, and conservative accounting practices. Investors who skip governance analysis may buy optically cheap stocks that later reveal hidden risks.

This pattern holds across both domestic and international markets tracked by ValueMarkers.

The screener's 120+ indicators quantify this relationship in real time across all 73 exchanges.

Institutional investors apply this same logic when constructing multi-billion dollar portfolios.

The consistency of these results across different market environments strengthens the case for systematic analysis.

Quarterly earnings reports provide natural checkpoints for reassessing these metrics.

Data from the past five years confirms that this approach outperforms reactionary decision-making.

The ValueMarkers glossary explains each of these concepts with formulas, benchmarks, and practical examples.

This finding holds regardless of whether you invest in individual stocks, ETFs, or a combination of both.

The DCF calculator on ValueMarkers converts these abstract concepts into concrete fair value estimates.

Further reading: SEC EDGAR · Investopedia

Why pe ratio Matters

This section anchors the discussion on pe ratio. The detailed treatment, formula, and worked examples appear in the body of this article above. The points below summarize the most important takeaways for value investors who want to apply pe ratio in real portfolio decisions. ValueMarkers exposes the underlying data on every covered ticker via the screener and stock profile pages, so the concepts in this article translate directly into actionable filters.

Key inputs for pe ratio

See the main discussion of pe ratio in the sections above for the full treatment, including the inputs, the calculation methodology, the typical sector benchmarks, and the most common pitfalls to avoid. The ValueMarkers screener lets value investors filter the full universe of 100,000+ stocks across 73 exchanges using pe ratio alongside the rest of the 120-indicator composite, with sector percentiles and historical trends shown on every stock profile.

Sector benchmarks for pe ratio

See the main discussion of pe ratio in the sections above for the full treatment, including the inputs, the calculation methodology, the typical sector benchmarks, and the most common pitfalls to avoid. The ValueMarkers screener lets value investors filter the full universe of 100,000+ stocks across 73 exchanges using pe ratio alongside the rest of the 120-indicator composite, with sector percentiles and historical trends shown on every stock profile.

Related ValueMarkers Resources

• Pe Ratio — Glossary entry for Pe Ratio
• Pb Ratio — Glossary entry for Pb Ratio
• Dividend Yield — Dividend Yield is the metric used to how cheaply a stock trades relative to its fundamentals
• How Does The Stock Market Work — related ValueMarkers analysis
• How Does Stock Market Work — related ValueMarkers analysis
• Fair Value Vs Book Value — related ValueMarkers analysis

Frequently Asked Questions

what happens if the stock market crashes

During a stock market crash, broad indices typically decline 20% or more from recent highs. Historical crashes (2008, 2020) show that recoveries eventually follow, though timelines vary from months to years. Stocks with strong Altman Z-Scores (above 3.0) and low debt-to-equity ratios tend to survive better. ValueMarkers' screener helps identify financially resilient companies before downturns occur.

what time does the stock market open

The U.S. stock market (NYSE and NASDAQ) opens at 9:30 AM Eastern Time, Monday through Friday. Pre-market trading begins at 4:00 AM ET, and after-hours trading extends until 8:00 PM ET. These hours apply to regular trading days; holidays and early closures follow a published schedule.

are stock markets closed today

U.S. stock markets are closed on weekends and designated holidays including New Year's Day, Martin Luther King Jr. Day, Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. Check the NYSE or NASDAQ holiday calendars for the complete schedule.

what time does the stock market close

The U.S. stock market closes at 4:00 PM Eastern Time on regular trading days. After-hours trading continues until 8:00 PM ET. On early-close days (such as the day before Thanksgiving), markets close at 1:00 PM ET. Value investors generally focus on long-term fundamentals rather than intraday timing.

when does the stock market open

The NYSE and NASDAQ open at 9:30 AM Eastern Time. Pre-market sessions begin at 4:00 AM ET on most platforms. For international markets covered by ValueMarkers across 73 exchanges, opening times vary by time zone. The London Stock Exchange opens at 8:00 AM GMT, while Tokyo opens at 9:00 AM JST.

why is the stock market down today

Market declines happen for various reasons: disappointing economic data, rising interest rates, geopolitical tensions, or negative earnings surprises. On any given down day, the specific cause matters less than your portfolio's fundamental quality. Companies with high Piotroski Scores (7+) and strong Altman Z-Scores (above 3.0) historically recover faster from broad selloffs.

Want to deepen your understanding of how the stock market works? The ValueMarkers Academy provides structured lessons on fundamental analysis, valuation techniques, and systematic investing. Start building your analytical edge today.

Written by Javier Sanz, Founder of ValueMarkers

Last updated April 2026

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Disclaimer: This content is for informational and educational purposes only and does not constitute investment advice, a recommendation, or an offer to buy or sell any security. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.