
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 valueweighted 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 riskfree 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 riskfree 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 meanvariance framework Not all portfolios of assets are […]