market reaction to e-commerce impairments evidenced by website outages joseph h. anthony* wooseok...
Post on 15-Jan-2016
253 views
TRANSCRIPT
![Page 1: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/1.jpg)
Market Reaction to E-Commerce ImpairmentsEvidenced by Website Outages Joseph H. Anthony*Wooseok Choi**Severin Grabski*
*Department of Accounting and Information SystemsMichigan State University **Department of Accounting, California State University at Los Angeles
![Page 2: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/2.jpg)
Presentation
Introduction & Research Question Research Approach Prior Research Literature Hypotheses Regression Models Results
![Page 3: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/3.jpg)
Last summer, on-line auction site eBay Inc. unwittingly became the latest poster child for Web-site crashes, as it endured a host of outages, the worst of which took the site offline for nearly 22 hours on June 10. Bidders and sellers were angry, and investors sent the company’s stock down more than 25% in the two business days after the problems began, slashing nearly $6 billion off its market value.
Wall Street Journal: November 22, 1999
![Page 4: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/4.jpg)
Systematically investigate the impact of website and other e-commerce related outages on economic returns as measured by the stock market
“Self-Inflicted”, not
“Hacked”
Research Objective
![Page 5: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/5.jpg)
Direct Measures of Loss Due to Website/ e-commerce Outages Repeated outages resulted in loss of 10% of
customer base (McKnight 1997) Hour of web downtime results in $50,000 in
lost sales (Woods 2000)
Unfortunately, data is generally not available
![Page 6: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/6.jpg)
Alternative Costs of Website/e-commerce Outages TD Waterhouse fined by SEC (Simon 2001) TicketMaster - Prioritized business units
Ticketing Online Personals Cityguide
Lost revenues from ticketing is real Might result in permanent loss of customer
(Fonseca 2001)
Again, data is generally not available
![Page 7: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/7.jpg)
Alternative Costs of Website/e-commerce Outages
CIOs “overspent” on security (Yager 2002) Spend average of $3.6M on Security Average cost of security breach - $193,000
Might be missing other costs, the potential decline in the market value of the firm
![Page 8: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/8.jpg)
Other Costs of Website/e-commerce Outages
Hacker Attacks (Ettredge and Richardson 2002) Resulted in negative abnormal stock returns
BUT---
Firms examined were only in the same industry as “hacked” firms, they were not hacked!!
![Page 9: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/9.jpg)
Other Costs of Website/e-commerce Outages
Security Breaches (Campbell et al. 2003) Resulted in negative abnormal stock returns Market discriminated between types of attacks
Significant negative reaction to unauthorized access to confidential data
No significant reaction when not involving confidential data
![Page 10: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/10.jpg)
Other Costs of Website/e-commerce Outages
Software Vulnerabilities – Cost to software developers (Telang and Wattal 2005) 18 firms, 146 announcements (1999-2004) Resulted in negative returns of .6% stock price per
disclosure Average loss $.86B per vulnerability announcement
More negative impact w/o patch (.8%) More severe flaws have more negative impact Confidentiality breach resulted in greater
decline than other breach types (.75%)
![Page 11: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/11.jpg)
Event Studies Investors process information about expected and
unexpected events and consider these events in the valuation of shares
Event studies examine the residual price change of a sample of firms for a window of time on either side of an identifiable “event,” such as announcements of earnings, stock splits and dividends, cash dividends, earnings forecasts, or changes in accounting methods. The influence of economy-wide and, if necessary, additional factors such as industry-wide information on stock prices is extracted to obtain a residual return. The expected value of the residual price changes, not conditioning on the event, is zero. (Beaver 1998, p.133)
![Page 12: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/12.jpg)
Prior Accounting & Finance Research
Beaver (1968) & Ball and Brown (1968) – stock returns and accounting earnings
Aharony and Swary (1980) – quarterly dividend announcements
Eccher et. al. (1996) & Barth et. al. (1996) – fair value disclosures by banks
Anthony (1987) – expected and unexpected news releases
![Page 13: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/13.jpg)
Prior IT Research Dos Santos et al. (1983) - innovative uses of IT
rewarded Subramani and Walden (1999) - E-commerce
initiatives Krishnan and Sriram (2000) - estimates of Y2K
compliance costs Chatterjee et al. (2001) - announcement of CIO
position creation Im et al. (2001) – IT investment announcements
![Page 14: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/14.jpg)
E-Commerce Firm Valuation Measures of website usage are value
relevant, they provide incremental explanatory power for stock prices (Trueman et al. 2000) Number of unique visitors Number of page views
Bartove et al. (2002) and Rajgopal et al. (2003), also provide research results related to the valuation of internet/e-commerce firms.
![Page 15: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/15.jpg)
Hypotheses
H1: There will be a significant negative association between an outage announcement and a firm’s stock returns.
H2: Firms with a high percentage of on-line revenue will have a significantly more negative association in the stock returns than firms with a low percentage of on-line revenue.
![Page 16: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/16.jpg)
Internet Firm Types (Barua et al. 1999, 2000) Infrastructure Providers
Provide the backbone and basic Internet services
Commerce Providers Provide goods and services to businesses (B2B)
and individuals (B2C) over the Internet (either as an intermediary or directly)
![Page 17: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/17.jpg)
Outage Type
Two basic types of outages reported by the news services E-mail
The e-mail function of a website fails, but the website itself works well without shutting down
Non E-mail outage (Website) The website is completely shut down or some important
functions other than an e-mail failure (e.g., stock trading functions)
![Page 18: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/18.jpg)
Website Outage “The suit, filed in the Santa Clara County Superior Court by
the Alexander law firm of San Jose, Calif., is seeking unspecified damages for investors who claim they missed out on making money in the stock market because of the outage.
"E*Trade customers were unable to trade or obtain access to their online accounts on Feb. 3, 1999 for in excess of one hour, on Feb. 4, 1999, for in excess of two and one half hours, and for approximately one-half hour on Feb. 5, 1999," the Alexander suit said. "As a result of this 'virtual' lockout, class members lost potentially millions of dollars in damages." One E*Trade customer, Dar Hay of Memphis, Tenn., said he lost close to $12,000 last week when he was unable to cancel an order to buy 350 shares of brokerage firm Siebert Financial Corp.” (Reerink 1999b).
![Page 19: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/19.jpg)
Hypotheses
H3a: The negative stock market impact of an e-mail type outage will be greater than that of a non e-mail type outage (website) for infrastructure providers
H3b: The negative stock market impact of a non e-mail type outage (website) will be greater than that of an e-mail type outage for commerce providers
![Page 20: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/20.jpg)
Hypotheses
H4: Long outages (12+ hours) are more negatively associated with stock returns than short outages (1 hour or less)
H5: The frequency of outages is negatively associated with stock price changes.
![Page 21: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/21.jpg)
“Traditional” Event Study
Event date = first day reported by press Used a 4-day window
-1 to +2 -1 because the outage could have occurred past trading
but was picked up prior to the opening of trade the next day
+2 since some outages were longer than 24 hours Similar results obtained for 2 and 3-day windows
![Page 22: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/22.jpg)
Sample Selection Started with firms in “Internet 500” (ZDNet
Interactive Week Special Report 1999) Had at least one outage Eliminated firms not “primarily internet”
Internet revenues > 50% total revenues for 1997, 1998 or 1999 (retained 4 infrastructure firms – ATT, IBM, MCI, Sprint)
Stock return data available for 240 day estimation period
19 firms, 86 outages
![Page 23: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/23.jpg)
Sample Firms (Internet Classification)
Amazon.com (C) Excite, Inc.* (I) America Online (I) IBM (I)
Ameritrade Holding (C) Intuit (C) AT&T (I) MCI (I) At Home* (I) MindSpring Enterprises (I) CNet (C) Netcom (I) Dell Computer (C) Network Solutions (I) E*Trade Securities (C) Sprint (I) EBay (C) Schwab (C) Egghead.com (C) Yahoo! (C)
*Merged and treated as a single firm in this study
![Page 24: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/24.jpg)
Selected OutagesCompany Date Problem Length Effect
Amazon.com 1/7/98 Internal technical problem 12 hrs Website down
11/19/99 30 min Website down
Ameritrade 2/8/99Communication link to one of servers failure 28 min. Website down
AOL 1/15/97 A router device failure 3 hrs 45 min e-mail
3/24/98 Electronic malfunction 30 min e-mail
9/21/98 S/W malfunction 1 hr Website down
AT&T WorldNet 12/1/99 8 hrs
CNET 12/8/98 Black out Disable severs
Dell 4/13/99 an affiliate's computer system delay 30 min Online trading system crashed
11/23/99 hours Website down
EBay 11/2/98 H/W glitch 45 min Database server crashed
6/10-11/99 Sever OS failure 22 hrs
12/8/99 H/W problem 2 hr 46 min Website down
Egghead 2/28/98 System maintenance 48 hrs Website closed
E*trade 7/25/97 S/W application error 40 min Website down
2/3/99 S/W change 1 hr 15 min Trading function inaccessible
2/4/99 S/W change 1 hr Trading function inaccessible
![Page 25: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/25.jpg)
(1) R*it = a + bRmt + eit
(2) ARit = Rit – R*it
(3) CAR = ARit
Market Model
![Page 26: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/26.jpg)
Test of H1 – Outage - CARCumulative Abnormal Returns
(CAR)from Day –1 to Day +2 All observations (N=86)
Mean CAR -0.0392
Median CAR -0.0363
t-statistic -4.4487
p-value 0.0001
Number of positive CARs: 28
Number of negative CARs: 58
![Page 27: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/27.jpg)
Test of H2 – % Internet Revenue - CAR
p = 0.0171, 1-tail t-test
High50% or moreN=56
LowLess than 50%N=30
Mean CAR -0.0510 -0.0193
Median CAR -0.0404 -0.0212
Variance 0.0093 0.0014
Standard deviation 0.0967 0.0376
![Page 28: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/28.jpg)
Test of H3 – Outage Type and Firm TypeCARit = 0 + 1WebOutageit + 2Ratioit + 3Lengthit +
4Typeit + 5(WebOutage*Type)it + 6(Ratio*Type)it + 7(Length*Type)it + it
Variable Coefficient p-value
WebOutage 0.0050 0.891
Ratio 0.5582 0.845
Length -0.0041 0.007
Type 0.1230 0.658
WebOutage*Type -0.1052 0.025
Ratio* Type -0.1122 0.697
Length*Type 0.0037 0.059
Adj. R2 0.1421
![Page 29: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/29.jpg)
Test of H3 – Outage Type and Firm Type
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
Outage Type
Mea
n C
AR
InfrastructureProvider
-0.027 -0.056
Commerce Provider 0.008 -0.263
E-Mail Outage WebSite Outage
![Page 30: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/30.jpg)
Test of H4 – Long vs. Short OutagesOutage Mean CAR t-statistic p-value
Short (N=21) -0.0504 -2.2954 0.0327Long (N=13) -0.0579 -2.9726 0.0116
Statistical Significance of Difference
Statistics p-value t-test -0.2400 0.4069Wilcoxon z-test -0.4860 0.4859
![Page 31: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/31.jpg)
Test of H5 – More Frequent Outages1 - 4 outages reported versus more than 7
Frequency Mean CAR t-statistic p-value
More (N=40) -0.0426 -3.0082 0.0023
Less (N=16) -0.0397 -2.8384 0.0063
Statistical Significance of Difference
Statistics p-value
t-test -0.1500 0.4425
Wilcoxon z-test -0.1179 0.4531
![Page 32: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/32.jpg)
Test of H5 – More Frequent Outages Examined if a firm has an outage within 3 days of
another firm experiencing an outage
Outage Mean CAR t-statistic p-value
First (N=61) -0.0319 -3.1332 0.0027
Subsequent (N=25) -0.0587 -3.3493 0.0027
Statistical significance of difference
Statistics p-value
t-test -1.3805 0.0856
Wilcoxon z-test -1.5673 0.0585
![Page 33: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/33.jpg)
Post Hoc Economic Value Tests Measure the loss (gain) per share from day
–1 to day +2 Are a “crude” measure, but are in dollars Per-share changes in stock prices around
outage announcements (using winsorized data) :
Mean –$ 1.710
Median –$ 0.9375
![Page 34: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/34.jpg)
Sensitivity Analysis Confounding Effects
dividends and earnings, mergers and acquisitions, alliances, joint
ventures, and partnerships, law suits, important news releases related to technologies
None in 4-day window Also used 11-day window, eliminated 7 Obs. Results were consistent (and stronger)
![Page 35: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/35.jpg)
Firm Size Effects Large firm might have greater market
reaction than small firms More users influenced by outage
Small firms might have greater market reaction than large firms Less publicly available information – information
asymmetry (Atiase 1985, 1987) Regressed CAR on Total Assets (Sales,
Market Value of Equity, Working Capital) No Significant Effect
![Page 36: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/36.jpg)
Persistence of Losses – Short Outages
-0.015
-0.01
-0.005
0
0.005
0.01
-3 -2 -1 0 1 2 3 4 5 6 7
Trading Day
CA
R
Abnormal Return
![Page 37: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/37.jpg)
Persistence of Losses – Long Outages
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
-3 -2 -1 0 1 2 3 4 5 6 7
Trading Day
CA
R
Abnormal Return
![Page 38: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/38.jpg)
Limitations
Small sample size Was 100% for period under study
Limited to time period Consistent economic growth Avoid Y2K Avoid dotcom melt down 2001
Focus on B2C – for “commerce providers”
![Page 39: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/39.jpg)
Discussion
Firms are (differentially) penalized for outages IT Governance Impact
COSO ERM – Identification and assessment of risks affecting achievement of business objectives
Evaluate from
Future revenue stream
Firm market value Focused on B2C; impact on B2B?
![Page 40: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/40.jpg)
![Page 41: Market Reaction to E-Commerce Impairments Evidenced by Website Outages Joseph H. Anthony* Wooseok Choi** Severin Grabski* *Department of Accounting and](https://reader036.vdocuments.net/reader036/viewer/2022062322/56649d6b5503460f94a4a6dc/html5/thumbnails/41.jpg)
Summary Mean CAR surrounding outages is negative and
statistically significant Non e-mail outages result in significant negative CAR
for commerce providers; e-mail outages not significantly different than 0
No difference due to length of outage Firms earning more than 50% internet revenues had
significantly more negative CAR Repeat outages by same firm were not penalized
more heavily Two or more outages in the same window resulted in
the second firm more heavily penalized Cost of outage $ 1.71/share