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給生命定價(jià)

放大字體  縮小字體 發(fā)布日期:2008-03-10
核心提示:Your money or your life. The choice traditionally presented by the highwayman is supposed to have only one sensible answer. Money is, after all, no use to a corpse. Yet economists often study something rather like the highwayman's offer in an attemp


    "Your money or your life." The choice traditionally presented by the highwayman is supposed to have only one sensible answer. Money is, after all, no use to a corpse. Yet economists often study something rather like the highwayman's offer in an attempt to uncover the answer to an important question: how much is your life actually worth? 

    Like many awkward questions, this is one that has to be answered. Safety regulations save lives but also raise the cost of doing business, a cost we all pay through higher prices. Are they worth it? Our taxes pay for life-saving spending on road safety and fire fighting. Are they high enough, or too high? 

    So how much are we willing to spend to save a life? A traditional planner's approach used to be to measure the value of wages lost due to death or injury. That's dreadful: it confuses what I think my life is worth with what my boss thinks my life is worth. 

    So an alternative is to ask people how much they would pay for a safer car or kitchen cleaner. But such surveys do not always produce sensible results. Our answers depend on whether we're being offered a safer ?10 household cleaner and then asked if we want the more dangerous ?5 version, or whether we're offered the ?5 brand and then asked if we'll pay ?10 for the safer product. People often answer ”no” to both questions, contradicting themselves. These inconsistencies mean that we're either irrational or lying to pollsters, and perhaps both. 

    Economists therefore tend to prefer observing real choices. If you're willing to cross a busy street to pick up a ?20 note, the economist who put it there can infer something about your willingness to accept risk. More orthodox approaches look at career choices: if you're willing to be a lumberjack, part of that decision is to accept risk in exchange for financial reward. 

    Being a soldier is risky; so is being a drug-dealer or prostitute. The difficulty, evidently, is to disentangle the health risk and the financial reward from all the other motivations to choose a particular way of life. That isn't easy but economists try. 

    World Bank economist Paul Gertler and his colleagues reckoned that Mexican prostitutes valued their lives at about $50,000 per year, based on willingness to take money not to use condoms. At five times their annual earnings, that's a similar figure to workers accepting risky jobs in rich countries. 

    There are anomalies. Steve Freakonomics Levitt and sociologist Sudhir Venkatesh calculated that Chicago drug dealers seemed to value their entire lives at $50,000 to $100,000 - low indeed, even for poor young men whose career choice indicates a taste for risks. 

    Whatever the frailties of these calculations, they are the best we have. And far from cheapening life, this sort of research often highlights just how valuable our safer, healthier modern lives really are. Kevin Murphy of the Chicago Graduate School of Business recently visited London to present his research on the value of health improvements in the US since 1970. They're vast - about $10 trillion in today's money. Looking further back, if you had to choose between the material progress of the 20th century and the improvements in health, it would be a toss-up. The health gains are as valuable as everything else put together. Encouragingly, health in most developing countries has improved faster than in rich ones, suggesting that global inequality is falling. 

    And a more personal piece of good news: Murphy reckons the delicious cheeseburger I ate before interviewing him only cost me ?1 worth of health. Talk about a good deal. 

    “要錢(qián)還是要命。”這個(gè)通常由劫匪提出的選擇,理應(yīng)只有唯一明智的答案。畢竟,錢(qián)對(duì)死人來(lái)說(shuō)是沒(méi)用的。然而,經(jīng)濟(jì)學(xué)家們經(jīng)常研究一些與劫匪的提議非常相似的東西,以揭示一個(gè)重要問(wèn)題的答案:你的生命到底值多少錢(qián)? 

    與許多棘手的問(wèn)題一樣,這是個(gè)必須回答的問(wèn)題。安全規(guī)章能夠拯救生命,但也會(huì)提高經(jīng)營(yíng)成本,而這是一個(gè)我們通過(guò)更高的價(jià)格、都需要支付的成本。它們真的物有所值嗎?在道路安全和消防安全方面,我們繳納的稅款,用作了拯救生命的支出。它們是否足夠高,或者是過(guò)于高昂了呢?
    那么,為了拯救一條生命,我們?cè)敢饣ㄙM(fèi)多少呢?一種傳統(tǒng)計(jì)劃者的方法,曾是衡量死亡或受傷所導(dǎo)致工資損失的價(jià)值。這十分可怕:它混淆了我心目中自己生命的價(jià)值,與我老板心目中我生命的價(jià)值。 

    因此,另外一種選擇,就是詢(xún)問(wèn)人們?cè)敢鉃榘踩潭雀叩钠?chē)或廚房洗潔精支付多少錢(qián)。但是,這種調(diào)查并不總能得出明智的結(jié)論。我們的回答取決于,是否為我們提供了一種更為安全的、價(jià)值10英鎊的家用洗潔精,然后問(wèn)我們是否想要一個(gè)更為危險(xiǎn)的、價(jià)值5英鎊的產(chǎn)品;或者,是否向我們提供了售價(jià)5英鎊的品牌,然后問(wèn)我們是否將為更安全的產(chǎn)品支付10英鎊。人們對(duì)上述兩個(gè)問(wèn)題的回答往往都是“不”,這使他們自相矛盾。這些矛盾意味著,我們要么是缺乏理性,要么是在對(duì)調(diào)查者撒謊,或者兩者兼而有之。 

    因此,經(jīng)濟(jì)學(xué)家們往往更愿意去觀察真實(shí)的選擇。如果你愿意橫穿一條繁忙的街道,去撿一張20英鎊的紙幣,把錢(qián)放在那里的經(jīng)濟(jì)學(xué)家可推斷出一些與你承受風(fēng)險(xiǎn)的意愿有關(guān)的東西。更為正統(tǒng)的方法著眼于職業(yè)選擇:如果你愿意當(dāng)一名伐木工人,這個(gè)決定的一部分,便是承受風(fēng)險(xiǎn),以此換取金錢(qián)上的回報(bào)。 

    當(dāng)兵很危險(xiǎn);販毒或當(dāng)妓女也很危險(xiǎn)。顯然,難點(diǎn)在于,從所有其它選擇特定生活方式的動(dòng)機(jī)中,將健康方面的風(fēng)險(xiǎn)和金錢(qián)上的回報(bào)區(qū)別開(kāi)來(lái)。這并不容易,但經(jīng)濟(jì)學(xué)家正在進(jìn)行嘗試。 

    世界銀行(World Bank)經(jīng)濟(jì)學(xué)家保羅•格特勒(Paul Gertler)和他的同事們估計(jì),墨西哥妓女對(duì)其生命的估價(jià)為每年5萬(wàn)美元,其依據(jù)是她們?cè)敢鉃榱隋X(qián)而不使用安全套。這個(gè)數(shù)目是其年收入的5倍,比例與富裕國(guó)家承受危險(xiǎn)工作的工人相仿。 

    也有一些異常情況存在!赌Ч斫(jīng)濟(jì)學(xué)》(Freakonomics)作者史蒂文•萊維特(Steven Levitt)和社會(huì)學(xué)家素德赫•文卡特斯赫(Sudhir Venkatesh)計(jì)算,芝加哥的毒販對(duì)其整個(gè)生命的估值介于5萬(wàn)美元至10萬(wàn)美元。事實(shí)上這很低,即便對(duì)于職業(yè)選擇有風(fēng)險(xiǎn)偏好的貧窮年輕人來(lái)說(shuō)也是如此。 

    不管這些計(jì)算存在何種缺陷,它們都是我們所擁有的最佳方法。這遠(yuǎn)非貶低生命的價(jià)值,此類(lèi)研究往往突顯出,我們的更安全、健康的現(xiàn)代生活,到底有多么珍貴。芝加哥大學(xué)商學(xué)院(Chicago Graduate School of Business)的凱文•墨菲(Kevin Murphy)最近訪問(wèn)了倫敦,展示他目前的研究,課題是美國(guó)1970年后醫(yī)療保健改善的價(jià)值。這一價(jià)值非常巨大,以目前的貨幣計(jì)算,大約為10萬(wàn)億美元。回顧更久遠(yuǎn)的歲月,如果你必須在20世紀(jì)物質(zhì)方面的進(jìn)步,和醫(yī)療保健方面的改善中進(jìn)行選擇,這實(shí)在是難以取舍。醫(yī)療保健方面的收獲,與其它所有進(jìn)步的總和一樣珍貴。令人鼓舞的是,在多數(shù)發(fā)展中國(guó)家,醫(yī)療保健改善的速度比富裕國(guó)家更快,表明全球不平等正在縮小。 

    對(duì)我自己來(lái)說(shuō),一個(gè)好消息是:墨菲計(jì)算,我采訪他之前吃的那個(gè)美味奶酪漢堡包,只讓我損失了價(jià)值1英鎊的健康。這是筆很劃算的交易。
 

 

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關(guān)鍵詞: 生命 定價(jià)
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