Please ensure Javascript is enabled for purposes of website accessibility

Why Did the Stock Market Just Take a Late-Day Dive?

By Dan Caplinger – Aug 18, 2021 at 5:45PM

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

Declines of around 1% aren't a big deal, but they came in dramatic fashion.

The stock market remained relatively flat during much of the day on Wednesday. However, by the end of the day, the Dow Jones Industrial Average (^DJI 2.18%), S&P 500 (^GSPC 3.10%), and Nasdaq Composite (^IXIC) were all down around 1%. Much of the downward movement came in the final minutes of the trading day.


Percentage Change

Point Change




S&P 500



Nasdaq Composite



Data source: Yahoo! Finance.

It's important not to throw around words like "crash" or "plunge" lightly, and moves this small don't deserve those terms. However, a drop of more than 300 points for the Dow in the span of 90 minutes and a 165-point decline in just the last 18 minutes of trading aren't necessarily everyday events. Below, we'll look at what was behind all the late-day volatility.

Person about to come off a diving board into a pool.

Image source: Getty Images.

The latest from the Fed

Most of the movement in the stock market came after the Federal Reserve released the minutes from the July meeting of its Federal Open Market Committee (FOMC). This group makes decisions on monetary policy, most notably changes in targets for the federal funds rate and other key short-term interest rates.

The part of the minutes that drew the most attention was discussion of the Fed's quantitative easing asset purchase program. Committee members noted that employment levels have improved dramatically from their worst levels during the pandemic, and they tended to believe that rising levels of inflation that consumers have seen this year should prove to be transitory. However, significant movements in long-term Treasury bond yields led some committee members to conclude that market participants don't necessarily believe that price stability is a given.

Accordingly, most committee members seem to support the idea that the Fed should reduce its asset purchase activity sometime later this year. That's consistent with expectations in the market, with some seeing an announcement coming as early as September.

The FOMC went on to discuss what the phasedown period of asset purchases would look like. Here, sentiment was mixed, with some arguing that a quick reduction in purchases of mortgage-backed securities would help cool down an extremely strong housing market, while others suggested proportional reductions of purchases of both mortgage-backed securities and Treasury bonds.

What does this have to do with stocks?

At first glance, interest rate decisions might seem to have little impact on stocks. However, many investors have looked to the bond market for guidance on the future direction of stock markets for quite a while.

The main concern policymakers and investors alike have is avoiding a repeat of the so-called "taper tantrum" of the early 2010s. At that time, when the Fed tried to unwind quantitative easing activity in the recovery from the financial crisis, it led to substantial volatility in the stock market. That's what's behind the Fed's much more gradual approach this time around, as it tries to provide plenty of advance warning to financial markets before moving forward with action.

Nevertheless, removing support from the bond market could still have an impact on stocks. Rising interest rates make bonds more attractive compared to stocks, and many investors who would have preferred fixed-income investments have instead chosen stocks because of the extremely low yields that bonds currently offer. At some point, yields will rise to high enough levels to prompt a shift in the other direction.

In addition, many companies have taken advantage of extremely low interest rates to borrow. If cheap financing comes to an end, it could have a disproportionate impact on stocks that have used leverage most effectively to date.

Be ready for whatever's next

The S&P 500 has effectively doubled since its March 2020 lows, and the Fed's assistance has played a key role in the recovery. It's only natural to expect some pullback as the central bank's accommodative programs start to ease up. That doesn't necessarily mean a correction or bear market is imminent, but it does provide some context in which to put the short-term movements of stocks.

Dan Caplinger has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.

Invest Smarter with The Motley Fool

Join Nearly 1 Million Premium Members Receiving…

  • New Stock Picks Each Month
  • Detailed Analysis of Companies
  • Model Portfolios
  • Live Streaming During Market Hours
  • And Much More
Get Started Now

Stocks Mentioned

Dow Jones Industrial Average (Price Return) Stock Quote
Dow Jones Industrial Average (Price Return)
$34,589.77 (2.18%) $737.24
S&P 500 Index - Price Return (USD) Stock Quote
S&P 500 Index - Price Return (USD)
$4,080.11 (3.10%) $122.48
NASDAQ Composite Index (Price Return) Stock Quote
NASDAQ Composite Index (Price Return)
$10,983.78 (%)

*Average returns of all recommendations since inception. Cost basis and return based on previous market day close.

Related Articles

Motley Fool Returns

Motley Fool Stock Advisor

Market-beating stocks from our award-winning analyst team.

Stock Advisor Returns
S&P 500 Returns

Calculated by average return of all stock recommendations since inception of the Stock Advisor service in February of 2002. Returns as of 11/30/2022.

Discounted offers are only available to new members. Stock Advisor list price is $199 per year.

Premium Investing Services

Invest better with The Motley Fool. Get stock recommendations, portfolio guidance, and more from The Motley Fool's premium services.