GET https://rct.dev.bbntimes.com/global-economy/bias-has-been-overestimated-at-the-expense-of-noise

Response
200 OK
IP
3.138.32.171
Profiled on
Token
3bd2db

ArticleController :: show

Request

GET Parameters

None

POST Parameters

None

Uploaded Files

None

Request Attributes

Key Value
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"App\Controller\ArticleController::show"
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"_security_main"
_stopwatch_token 
"ba3e82"
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"global-economy"
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"bias-has-been-overestimated-at-the-expense-of-noise"

Request Headers

Header Value
accept 
"*/*"
accept-encoding 
"gzip, br, zstd, deflate"
connection 
"close"
cookie 
"PHPSESSID=9v97u7681cos5l3121p7bm7dd2"
host 
"rct.dev.bbntimes.com"
user-agent 
"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
x-php-ob-level 
"1"

Request Content

Request content not available (it was retrieved as a resource).

Response

Response Headers

Header Value
cache-control 
"no-cache, private"
content-type 
"text/html; charset=UTF-8"
date 
"Sat, 22 Feb 2025 13:50:07 GMT"
link 
"</build/runtime.js>; rel="preload"; as="script",</build/644.js>; rel="preload"; as="script",</build/502.js>; rel="preload"; as="script",</build/app.js>; rel="preload"; as="script",</build/view-more.js>; rel="preload"; as="script",</build/term-condition.js>; rel="preload"; as="script",</build/contact.js>; rel="preload"; as="script",</build/scroll-infinite-article.js>; rel="preload"; as="script",</build/app.css>; rel="preload"; as="style",</build/cookie-style.css>; rel="preload"; as="style",</build/term-condition-css.css>; rel="preload"; as="style",</build/contact-css.css>; rel="preload"; as="style",</build/comment-css.css>; rel="preload"; as="style""
x-debug-token 
"3bd2db"

Cookies

Request Cookies

Key Value
PHPSESSID 
"9v97u7681cos5l3121p7bm7dd2"

Response Cookies

No response cookies

Session 6

Session Metadata

Key Value
Created 
"Sat, 22 Feb 25 13:49:45 +0000"
Last used 
"Sat, 22 Feb 25 13:50:04 +0000"
Lifetime 
0

Session Attributes

Attribute Value
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"UORZA5XvVG8La_mJcFbfabhuWvjBtakgxFWKRneNYPc"
_csrf/https-cookie_accept 
"WaTDBlrbpPKkXVFXEV2GCQ5L1ytu0hKl8M8PiJ7_4DI"

Session Usage

6 Usages
Stateless check enabled
Usage
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Symfony\Component\Security\Csrf\TokenStorage\SessionTokenStorage:79
Show trace 
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Symfony\Component\Security\Csrf\TokenStorage\SessionTokenStorage:52
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Show trace 
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    "function" => "run"
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]
Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage:41
Show trace 
[
  [
    "file" => "/var/www/vhosts/dev.bbntimes.com/rct.dev.bbntimes.com/vendor/symfony/security-core/Authentication/Token/Storage/UsageTrackingTokenStorage.php"
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    "function" => "getMetadataBag"
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]
Symfony\Component\Security\Http\Firewall\ContextListener:171
Show trace 
[
  [
    "file" => "/var/www/vhosts/dev.bbntimes.com/rct.dev.bbntimes.com/vendor/symfony/security-http/Firewall/ContextListener.php"
    "line" => 171
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    "function" => "__invoke"
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Flashes

Flashes

No flash messages were created.

Server Parameters

Server Parameters

Defined in .env

Key Value
APP_ENV 
"dev"
APP_SECRET 
"0a988e63f011514eaabfc650b599af4d"
CORS_ALLOW_ORIGIN 
"*"
DATABASE_URL 
"mysql://bbndb_rctuser:33F5W25z40or0f7@localhost:3306/rct_bbntimes"
GOOGLE_RECAPTCHA_SECRET_KEY 
"6LdV5fgpAAAAANxzTG8ZMfIjil1wu-1vrQvnUt-x"
GOOGLE_RECAPTCHA_SITE_KEY 
"6LdV5fgpAAAAAENKcn73MJAhQrbtQeqgyC4wDLMP"
MAILER_DSN 
"smtp://no-reply%40rct.dev.bbntimes.com:Bl6%26gLD48%26Of919@rct.dev.bbntimes.com:465"
MARIADB_PASSWORD 
"i!87pK&!85ezc8"

Defined as regular env variables

Key Value
APP_DEBUG 
"1"
BASE 
"/public"
CONTEXT_DOCUMENT_ROOT 
"/var/www/vhosts/dev.bbntimes.com/rct.dev.bbntimes.com"
CONTEXT_PREFIX 
""
DOCUMENT_ROOT 
"/var/www/vhosts/dev.bbntimes.com/rct.dev.bbntimes.com"
FCGI_ROLE 
"RESPONDER"
GATEWAY_INTERFACE 
"CGI/1.1"
HTTPS 
"on"
HTTP_ACCEPT 
"*/*"
HTTP_ACCEPT_ENCODING 
"gzip, br, zstd, deflate"
HTTP_CONNECTION 
"close"
HTTP_COOKIE 
"PHPSESSID=9v97u7681cos5l3121p7bm7dd2"
HTTP_HOST 
"rct.dev.bbntimes.com"
HTTP_USER_AGENT 
"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"
PASSENGER_COMPILE_NATIVE_SUPPORT_BINARY 
"0"
PASSENGER_DOWNLOAD_NATIVE_SUPPORT_BINARY 
"0"
PATH 
"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
PHP_SELF 
"/public/index.php"
PP_CUSTOM_PHP_CGI_INDEX 
"plesk-php81-fastcgi"
PP_CUSTOM_PHP_INI 
"/var/www/vhosts/system/rct.dev.bbntimes.com/etc/php.ini"
QUERY_STRING 
""
REDIRECT_BASE 
"/public"
REDIRECT_HTTPS 
"on"
REDIRECT_PASSENGER_COMPILE_NATIVE_SUPPORT_BINARY 
"0"
REDIRECT_PASSENGER_DOWNLOAD_NATIVE_SUPPORT_BINARY 
"0"
REDIRECT_REDIRECT_HTTPS 
"on"
REDIRECT_REDIRECT_PASSENGER_COMPILE_NATIVE_SUPPORT_BINARY 
"0"
REDIRECT_REDIRECT_PASSENGER_DOWNLOAD_NATIVE_SUPPORT_BINARY 
"0"
REDIRECT_REDIRECT_SCRIPT_URI 
"https://rct.dev.bbntimes.com/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
REDIRECT_REDIRECT_SCRIPT_URL 
"/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
REDIRECT_REDIRECT_SSL_TLS_SNI 
"rct.dev.bbntimes.com"
REDIRECT_REDIRECT_STATUS 
"200"
REDIRECT_REDIRECT_UNIQUE_ID 
"Z7nWDriBoyj8JZ8-HGyJRwAAAAY"
REDIRECT_SCRIPT_URI 
"https://rct.dev.bbntimes.com/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
REDIRECT_SCRIPT_URL 
"/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
REDIRECT_SSL_TLS_SNI 
"rct.dev.bbntimes.com"
REDIRECT_STATUS 
"200"
REDIRECT_UNIQUE_ID 
"Z7nWDriBoyj8JZ8-HGyJRwAAAAY"
REDIRECT_URL 
"/public/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
REMOTE_ADDR 
"3.138.32.171"
REMOTE_PORT 
"9535"
REQUEST_METHOD 
"GET"
REQUEST_SCHEME 
"https"
REQUEST_TIME 
1740232206
REQUEST_TIME_FLOAT 
1740232206.8861
REQUEST_URI 
"/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
SCRIPT_FILENAME 
"/var/www/vhosts/dev.bbntimes.com/rct.dev.bbntimes.com/public/index.php"
SCRIPT_NAME 
"/public/index.php"
SCRIPT_URI 
"https://rct.dev.bbntimes.com/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
SCRIPT_URL 
"/global-economy/bias-has-been-overestimated-at-the-expense-of-noise"
SERVER_ADDR 
"5.196.1.209"
SERVER_ADMIN 
"[no address given]"
SERVER_NAME 
"rct.dev.bbntimes.com"
SERVER_PORT 
"443"
SERVER_PROTOCOL 
"HTTP/1.1"
SERVER_SIGNATURE 
"<address>Apache Server at rct.dev.bbntimes.com Port 443</address>\n"
SERVER_SOFTWARE 
"Apache"
SSL_TLS_SNI 
"rct.dev.bbntimes.com"
SYMFONY_DOTENV_VARS 
"APP_ENV,APP_SECRET,DATABASE_URL,MARIADB_PASSWORD,CORS_ALLOW_ORIGIN,MAILER_DSN,GOOGLE_RECAPTCHA_SECRET_KEY,GOOGLE_RECAPTCHA_SITE_KEY"
UNIQUE_ID 
"Z7nWDriBoyj8JZ8-HGyJRwAAAAY"

Sub Requests 6

CookieController :: renderAnalysis (token = 3648c5)

Key Value
_controller 
"App\Controller\CookieController::renderAnalysis"
_format 
"html"
_locale 
"en"
_stopwatch_token 
"544944"

AppController :: renderHeader (token = 576337)

Key Value
_controller 
"App\Controller\AppController::renderHeader"
_format 
"html"
_locale 
"en"
_stopwatch_token 
"e32085"
slug 
"home"

ArticleController :: trendingArticle (token = ba17dd)

Key Value
_controller 
"App\Controller\ArticleController::trendingArticle"
_format 
"html"
_locale 
"en"
_stopwatch_token 
"052168"
category 
"Global Economy"

ArticleController :: relatedArticles (token = 44945e)

Key Value
_controller 
"App\Controller\ArticleController::relatedArticles"
_format 
"html"
_locale 
"en"
_stopwatch_token 
"3acaa7"
current_article 
App\Entity\Article {#1094
  -id: 3859
  -title: "Bias Has Been Overestimated at the Expense of Noise"
  -slug: "bias-has-been-overestimated-at-the-expense-of-noise"
  -introtext: "<div class="tr_bq"><span style="color: #000000;">Daniel Kahneman (Nobel 2002) is of course known for his extensive work on behavioral biases and how they affect economic decisions. He's now working on a new book, together with Olivier Sibony and Cass Sunstein, in which he focuses instead on the concept of "noise".</span></div>\r\n"
  -content: """
    \r\n
    <div><span style="color: #000000;"></span></div>\r\n
    <div><span style="color: #000000;">Here's a&nbsp;précis&nbsp;of Kahneman's current thinking on this and other topics, drawn from an interview with Tyler Cowen (both video and a transcript are available at&nbsp;</span><a href="https://medium.com/conversations-with-tyler/tyler-cowen-daniel-kahneman-economics-bias-noise-167275de691f">"Daniel Kahneman on Cutting Through the Noise," December 19, 2018)</a>.<br /><br /></div>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">KAHNEMAN: First of all, let me explain what I mean by noise. I mean, just randomness. And it’s true within individuals, but it’s especially true among individuals who are supposed to be interchangeable in, say, organizations. ...</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">I’ll tell you where the experiment from which my current fascination with noise arose. I was working with an insurance company, and we did a very standard experiment. They constructed cases, very routine, standard cases. Expensive cases\u{200A}—\u{200A}we’re not talking of insuring cars. We’re talking of insuring financial firms for risk of fraud.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">So you have people who are specialists in this. This is what they do. Cases were constructed completely realistically, the kind of thing that people encounter every day. You have 50 people reading a case and putting a dollar value on it.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">I could ask you, and I asked the executives in the firm, and it’s a number that just about everybody agrees. Suppose you take two people at random, two underwriters at random. You average the premium they set, you take the difference between them, and you divide the difference by the average.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">By what percentage do people differ? Well, would you expect people to differ? And there is a common answer that you find, when I just talk to people and ask them, or the executives had the same answer. It’s somewhere around 10 percent. That’s what people expect to see in a well-run firm.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">Now, what we found was 50 percent, 5–0, which, by the way, means that those underwriters were absolutely wasting their time, in the sense of assessing risk. So that’s noise, and you find variability across individuals, which is not supposed to exist.</span><br /><span style="color: #000000;">And you find variability within individuals, depending morning, afternoon, hot, cold. A lot of things influence the way that people make judgments: whether they are full, or whether they’ve had lunch or haven’t had lunch affects the judges, and things like that.</span><br /><span style="color: #000000;">Now, it’s hard to say what there is more of, noise or bias. But one thing is very certain\u{200A}—\u{200A}that bias has been overestimated at the expense of noise. Virtually all the literature and a lot of public conversation is about biases. But in fact, noise is, I think, extremely important, very prevalent.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">There is an interesting fact\u{200A}—\u{200A}that noise and bias are independent sources of error, so that reducing either of them improves overall accuracy. There is room for . . . and the procedures by which you would reduce bias and reduce noise are not the same. So that’s what I’m fascinated by these days.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">Now, it’s hard to say what there is more of, noise or bias. But one thing is very certain\u{200A}—\u{200A}that bias has been overestimated at the expense of noise. Virtually all the literature and a lot of public conversation is about biases. But in fact, noise is, I think, extremely important, very prevalent. ...</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">COWEN: Do you see the wisdom of crowds as a way of addressing noise in business firms? So you take all the auditors, and you somehow construct a weighted average? ...</span><br /><br /><span style="color: #000000;">KAHNEMAN: With respect to the underwriters, I would expect, certainly, that if you took 12 underwriters assessing the same risk, you would eliminate the noise. You would be left with bias, but you would eliminate one source of error, and the question is just price. Google, for example, when it hires people, they have a minimum of four individuals making independent assessments of each candidate. And that reduces the standard deviation of error at least by a factor of two.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">COWEN: So is the business world, in general, adjusting for noise right now? Or only some highly successful firms?</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">KAHNEMAN: I don’t know enough about that. All I do know is that, when we pointed out the results, the bewildering results of the experiment on underwriters, and there was another unit\u{200A}—\u{200A}people who assess the size of claims. Again, actually, it’s more than 50 percent. Like 58 percent. The thing that was the most striking was that nobody in the organization had any idea that this was going on. It took people completely by surprise.</span><br /><span style="color: #000000;">My guess now, that wherever people exercise judgment, there is noise. And, as a first rule, there is more noise than people expect, and there’s more noise than they can imagine because it’s very difficult to imagine that people have a very different opinion from yours when your opinion is right, which it is. ...</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">COWEN: If you’re called in by a CEO to give advice\u{200A}—\u{200A}and I think sometimes you are\u{200A}—\u{200A}how can I reduce the noise in my decisions, the decisions of the CEO, when there’s not a simple way to average? The firm doesn’t have a dozen CEOs. What’s your advice? ...</span><br /><span style="color: #000000;">KAHNEMAN: [T]here is one thing that we know that improves the quality of judgment, I think. And this is to delay intuition. ... Delaying intuition until the facts are in, at hand, and looking at dimensions of the problem separately and independently is a better use of information.</span><br /><br /><span style="color: #000000;">The problem with intuition is that it forms very quickly, so that you need to have special procedures in place to control it except in those rare cases\u{200A}... \u{200A}where you have intuitive expertise. That’s true for athletes\u{200A}—\u{200A}they respond intuitively. It’s true for chess masters. It’s true for firefighters ... I don’t think CEOs encounter many problems where they have intuitive expertise. They haven’t had the opportunity to acquire it, so they better slow down. ... It’s not so much a matter of time because you don’t want people to get paralyzed by analysis. But it’s a matter of planning how you’re going to make the decision, and making it in stages, and not acting without an intuitive certainty that you are doing the right thing. But just delay it until all the information is available.</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">COWEN: And does noise play any useful roles, either in businesses or in broader society? Or is it just a cost we would like to minimize?</span></p>\r\n
    <p style="padding-left: 30px;"><span style="color: #000000;">KAHNEMAN: There is one condition under which noise is very useful. If there is a selection process, evolution works on noise. You have random variation and then selection. But when there is no selection, noise is just a cost. ... Bias and noise do not cover the universe. There are other categories.</span><br /><br /></p>\r\n
    <p><span style="color: #000000;">A version of this article first appeared on</span> <a href="http://conversableeconomist.blogspot.com/2019/04/bias-has-been-overestimated-at-expense.html" target="_blank" rel="noopener">Conversable Economist</a>.&nbsp;</p>
    """
  -user: Proxies\__CG__\App\Entity\User {#1092 …}
  -createdAt: DateTime @1555003406 {#1145
    date: 2019-04-11 17:23:26.0 UTC (+00:00)
  }
  -updatedAt: DateTime @1555007297 {#1150
    date: 2019-04-11 18:28:17.0 UTC (+00:00)
  }
  -deletedAt: null
  -category: App\Entity\Category {#445 …}
  -status: "published"
  -imageCard: Proxies\__CG__\App\Entity\File {#1184 …}
  -ImageHeader: Proxies\__CG__\App\Entity\File {#1184 …}
  -featured: false
  -mainView: false
  -clicks: 4622
  -comments: Doctrine\ORM\PersistentCollection {#1125 …}
  -reviewed_at: DateTime @1555003398 {#1148
    date: 2019-04-11 17:23:18.0 UTC (+00:00)
  }
  -metakey: ""
  -metadesc: "Daniel Kahneman (Nobel 2002) is of course known for his extensive work on behavioral biases and how they affect economic decisions. He's now working on a new book, together with Olivier Sibony and Cass Sunstein, in which he focuses instead on the concept of "noise"."
  -robots: null
  -publishedAt: DateTime @1555003398 {#1147
    date: 2019-04-11 17:23:18.0 UTC (+00:00)
  }
  -canonical: null
  -superTag: null
}

AppController :: renderFooter (token = 31ecbb)

Key Value
_controller 
"App\Controller\AppController::renderFooter"
_format 
"html"
_locale 
"en"
_stopwatch_token 
"6f05e4"

CookieController :: renderCookie (token = 4bc081)

Key Value
_controller 
"App\Controller\CookieController::renderCookie"
_format 
"html"
_locale 
"en"
_stopwatch_token 
"a0860b"