Market Sentiment

In the short run the market is a voting machine, in the long run a weighing machine – Benjamin Graham is said to have put it that way. Over years, earnings and cash flows count. Over days and weeks, what counts most is how investors feel. That mood can be measured – and its extremes are often more instructive than any forecast.

Why sentiment matters so much#

The value of a large company barely changes from one day to the next. Its share price can jump 5% or 10%. The difference is psychology: investors react to news, to what others are doing and to their own gains and losses. In upswings confidence grows until it tips into overconfidence. In downswings fear grows until it tips into panic.

That pendulum is why markets overshoot in both directions – and why measuring sentiment is worthwhile.

The VIX: the fear gauge#

The VIX (Cboe Volatility Index) is calculated from the prices of options on the S&P 500. It shows the volatility options traders expect over the next 30 days, expressed as an annualised percentage.

The VIX almost always rises when stocks fall, because investors pay more for protection. Its highest close came in March 2020 at above 82; in the financial crisis in November 2008 it also closed above 80.

Fear and greed in one number#

A fear and greed index combines several sentiment signals into a single number between 0 (extreme fear) and 100 (extreme greed). Typical components:

• Momentum: how far is the market above or below its moving average?
• Volatility: how high is the VIX relative to its average?
• Market breadth: are many stocks rising or only a few large ones?
• New highs vs. new lows: how many stocks are hitting 52-week highs or lows?
• Safe-haven demand: is money flowing into bonds or gold?
• Hedging demand: how many puts are bought relative to calls?

CNN’s index is the best known. On our news page you’ll find our own sentiment gauge built on similar principles.

Other sentiment measures#

• Investor surveys: the American Association of Individual Investors (AAII) asks members every week whether they are bullish, neutral or bearish.
• Put/call ratio: the ratio of puts to calls traded. High readings signal heavy hedging and fear.
• Fund flows: is money flowing into or out of stock funds?
• Positioning: how heavily invested are professionals? How high is margin debt?
• Magazine covers: when market topics make the front page of general-interest magazines, the mood is often well advanced.

Thinking contrarian – with care#

A simple rule follows from sentiment: extremes are often turning points. When everyone is pessimistic and has sold, few sellers remain and a little good news can lift prices. When everyone is optimistic and fully invested, new buyers run out and small disappointments trigger sharp drops.

What you can do with it#

For long-term investors, the biggest benefit of sentiment indicators isn’t timing but self-defence:

• When the mood is euphoric and you feel the urge to bet everything on a hot stock, that’s a good moment to pause.
• When panic reigns and you want to sell everything, history reminds you that such moments were often the best entry points.
• A fixed plan with automatic contributions and rebalancing takes decisions out of emotional moments – and acts contrarian automatically.

Summary#

In the short run, fear and greed move markets more than fundamentals. The VIX, fear and greed indices, surveys and the put/call ratio make sentiment measurable. Extremes have often been turning points, but never with reliable timing. Their greatest value is in keeping your own emotions in check.