Descriptive statistics for stock returns

Descriptive statistics offer a simple way of understanding distributions of stock returns. They give us an idea about a distribution’s centrality, dispersion, and other features. In this tutorial, we will show you how to generate descriptive statistics for stock returns using Excel’s data analysis tool. Jump to: Using Excel to get descriptive statistics for stock […]

Arbitrage pricing theory (APT)

In the previous lesson, we learned about the capital asset pricing model (CAPM). According to the CAPM, any risky asset’s expected return depends on its exposure to the market risk. So, CAPM is based on the idea that market risk is the sole systematic risk factor. Because systematic risk can’t be eliminated via diversification, risk-averse […]

Capital asset pricing model (CAPM)

The capital asset pricing model (or the CAPM) is probably one of the most commonly taught topics in finance. This is not because it is a perfect model. In fact, it is far from it. However, the CAPM is built upon some of the most fundamental concepts in finance. Furthermore, CAPM is widely used in […]

Systematic risk and unsystematic risk

When we talk about the risk of investing in stocks, corporate bonds, etc., we can distinguish between two main sources of risk: Systematic risk and unsystematic risk. The former relates to sources of risk that affect the entire market whereas the latter is risk specific to individual securities. Learning objectives Understand the distinction between systematic […]

What is the market portfolio?

The market portfolio is the market value-weighted portfolio of all risky assets in an economy. In this post, we show how the market portfolio is equivalent to the optimal risky portfolio when all investors behave according to the modern portfolio theory. Learning objectives Understand the link between the optimal risky portfolio and the market portfolio. […]

What is the optimal risky portfolio?

In the previous post, we explained that when there is no risk-free asset in an economy, investors should invest in one of the efficient portfolios that lie on the efficient frontier based on their risk tolerance. We added that, if a risk-free asset exists, then there is a unique efficient portfolio that all investors should […]

Efficient frontier – What is it?

The efficient frontier is the collection of all efficient portfolios in a market. But, what does that actually mean? How can investors distinguish between efficient portfolios and inefficient ones? Learning objectives Understand the concept of an efficient portfolio. Identify the main features of the efficient frontier. The mean-variance framework Not all portfolios of assets are […]

Order book – trading stocks and other securities

We know that a key feature of markets is that they bring buyers and sellers together. Markets facilitate trades between these two parties. One method markets can use to match buyers and sellers is through an order book. And, this is the topic of this post. Learning objectives Define what an order book is within […]

The risk of a portfolio – Calculator and formula

We often say that risk and return are two sides of the same coin. You can’t discuss one without the other. In the previous post, we showed you how to calculate the return on a portfolio of assets. In this post, we explain the formula for portfolio risk. We also offer an easy-to-use portfolio risk […]