Re: [轉錄][新聞]買不到便宜菜？蘇嘉全：為何不買1 …
這則新聞非常的有趣，正好可以拿來當範例說明台灣很多的新聞。
反覆看了很多次，並不覺得蘇嘉全想表達的意思有啥問題。
從絕大多數的新聞中，蘇看起來想表達二件事：
1. 傳統市場的菜價有可能較貴，
2. 不要買貴的青菜，改買便宜的。
那為啥這新聞會引起軒然大波!?
這就是有趣的地方了 - 因為媒體呈現的方式。
這讓我聯想到之前看過的一篇經濟學的paper：
"Media Bias and Reputation," by Matthew Gentzkow and Jesse M. Shapiro,
Journal of Political Economy, vol. 114, pp. 280-316, 2006
這篇文章一開頭舉了個很有趣的例子，來說明新聞的呈現方式所引起的bias。
為了討論方便，我就只抄錄這段，有興趣的人可以去找原文出來看：
On December 2, 2003, American troops fought a battle in the Iraqi city
of Samarra. Fox News began its story on the event with the following
paragraph:
In one of the deadliest reported firefights in Iraq since the fall
of Saddam Hussein!|s regime, US forces killed at least 54 Iraqis
and captured eight others while fending off simultaneous convoy
ambushes Sunday in the northern city of Samarra.
The New York Times article on the same event began
American commanders vowed Monday that the killing of as
many as 54 insurgents in this central Iraqi town would serve
as a lesson to those fighting the United States, but Iraqis disputed
the death toll and said anger against America would
only rise.
And the English-language Web site of the satellite network Al Jazeera
(AlJazeera.net) began
The US military has vowed to continue aggressive tactics after
saying it killed 54 Iraqis following an ambush, but commanders
admitted they had no proof to back up their claims. The only
corpses at Samarra!|s hospital were those of civilians, including
two elderly Iranian visitors and a child.
不知情的人看了這三則報導，大概會以為這是三件不同的事。
回頭看看蘇嘉全的新聞，不禁令人回想起該paper中的論點：
媒體有"傾斜自身的立場、改變報導的角度，以符合其消費者的prior belief"
的reputational incentive。
而這誘因，竟是來自於媒體欲提昇其新聞品質、正確性的評價。
因為真實狀態太難得知or尚未得知，
所以消費者只能先用自身的prior去衡量新聞品質，
於是媒體只好扭曲所得知的資訊，以提昇其在消費者心中的評價。
簡單講，一堆自詡為質報、正派、高品質、為民喉舌/代言的媒體，
也是很努力的在"詳實報導"、"提昇新聞品質"。
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