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Capital Market Line definition and tutorial

The practice of asset allocation employed by millions of investment advisors worldwide originated with scholarly advancements in the 1960s.
  1. Define - Define the Capital Market Line.
  2. Context - Use it in a sentence.
  3. Video - See the video.
  4. Script - Read the transcript.
  5. Quiz - Test your knowledge.
by Paul Alan Davis, CFA, July 16, 2016
Updated: December 19, 2018
Even those without a formal training in Financial theory inherently understand the risk-return trade-off takeaway from Capital Market Line.

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Capital Market Line


Capital Market Line is a theoretical concept from the Capital Asset Pricing Model used to derive investor allocations to two assets: a Risk-Free asset like a T-Bill and the Market Portfolio of risk assets. It connects the Risk-Free asset return on the y-axis to the Efficient Frontier at the Market Portfolio. Portfolio allocations below the Market Portfolio imply lending (or buying bonds) and above imply borrowing (using leverage) to buy additional positions of the Market Portfolio. Where the client's Indifference Curve meets the line is at the Optimal Portfolio.

Synonym: CML

In a Sentence

Jim:  My client understands the Capital Market Line  and...
Ken:  Sorry Jim, is says right here in our ADV, clients cannot use leverage.


This video can be accessed in a new window or App , at the YouTube Channel or from below.

Capital Market Line definition for investment modeling (5:19)

Video Script

The script includes two sections where we visualize and demonstrate the concept of the Capital Market Line.


We're sitting in Excel, and this is a snippet from our boot camp course.

There we cover all of the curves, lines and dots shown here in one 40-minute video, but because most people can't sit still that long, we break it out into eleven 4-5 minute videos, just like this one. I'll provide a link to boot camp video if you'd like the whole story. (See the tutorial Ace Your Portfolio Theory Exam instead).

Ok, we have a chart, with expected return on the y-axis and expected risk on the x-axis. The 'expected' timeframe assumes we've taken 'historical' data as input, run a regression to generate 'expected' return and risk.

The curves and dots on the right represent advancements in Modern Portfolio Theory, covered elsewhere, and Capital Market Theory, or CAPM, developed in the 1960s, shifted the conversation to the left here.

Academic theories require that we hold other variables constant, with assumptions and here is a list of MPT assumptions to review later. We could tack on another set for Capital Market Theory and if you'd like more than this quick-and-dirty summary reach out to me for in-depth readings.


Let's demonstrate and focus on this definition. The Capital Market Line connects the Risk-Free Asset return, rf2 on the y-axis, to the Efficient Frontier dark green curve, at the Market Portfolio, labeled M2 here. At rf2 an investor allocates 100% in Treasury Bills. At M2, the investor allocates 100% to the Market Portfolio. The investor wouldn't choose point A because she would get more bang for her buck where the line's slope is the steepest. Ponder that for a second.

Think about it this way, an investor seeking a higher return must take risk, and move up this line. Each step of the way adding risky assets 25%, 50%, 75%, 100%. Think about buying T-Bills just as if you are lending to the government. You could keep going, past M2 and have maybe 200% invested in the Market Portfolio, with 100% of borrowed money. That's a difficult concept, but is possible, yet uncommon.

Capital Market Theory demonstrated how investors could choose between these two assets exclusively, selecting an allocation that matches her tolerance for risk, thereby shifting this light green indifference curve, which was over here for the MPT examples, up and down the Capital Market Line. Risk-averse investors here, and risk-seeking investors here.


Click box for answer.

If the risk-free rate was equal to the expected Market rate there would be no reason to invest in stocks? | True or False?

True, theoretically.

Questions or Comments?

Still unclear on the Capital Market Line? Leave a question in the comments section on YouTube or check out the Quant 101 Series, specifically Ace Your Portfolio Theory Exam.

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  • To see all terms in the Glossary, click Outline.
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