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Modern Labor Economics- Theory and Public Policy (GE) 12-e



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1.Eight new Boxed Examples in the Twelfth Edition address engaging topics such as the “Big Mac” real-wage index, how housing subsidies affect labor supply, the effects of linguistics on personal discount rates, and the effects of race on called strikes in baseball.

2.An expanded treatment of the labor-market effects of immigration in Chapter 10 ties into the growing debate on unauthorized immigration, one of today’s hot-button issues. The chapter now includes analysis of the elasticity of the labor demand curve and the economic effects of low-skilled immigration on higher-skilled workers.

3.An enhanced discussion of human capital investments in Chapter 9 offers a more detailed analysis of how “behavioral skills,” psychic costs of learning, and personal discount rates affect the returns to education. These issues are highly relevant to students as they look ahead to their future careers.

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  • 出版社:華泰文化

    新功能介紹
  • 出版日期:2014/11/05
  • 語言:英文


商品網址: Modern Labor Economics- Theory and Public Policy (GE) 12-e

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07/7/3967892示意圖,非新聞當事螃蟹。ingimage 每年9月到10月正是螃蟹黃多膏滿之時,但網路謠言也多到讓人「望蟹止步」。陸媒騰訊網為此整理以下8大謠言,並請華南農業大學食品科學教授趙力超解答,提醒消費者別中招。

謠言一:吃蟹黃致癌

事實:如果在良好水域生長,螃蟹的重金屬含量微乎其微。從生物角度,螃蟹最易受污染的部位其實並不是蟹黃,而是蟹腮、蟹肺、蟹肝等不食用的部位。

謠言二:螃蟹灌水加重

事實:螃蟹其實是很脆弱的生物,一旦注水,臟器所處環境的滲透壓會發生劇變,殼一旦破損,不出10分鐘,一定會死亡。

謠言三:螃蟹打針

事實:近日流傳網路給螃蟹打針的影片,其實是在上蒸籠前向螃蟹注入酒和佐料,會更入味。螃蟹注水很快就會死亡,注入其他液體也是一樣。

謠言四:螃蟹注膠

事實:之前流傳一則煮熟的膀蟹疑似有膠狀物的影片,讓人倒盡胃口。其實透明膠狀物質是蟹膏,主要為雄性的副性腺及其分泌物,營養價值高,且十分美味。

謠言五:螃蟹加番茄等同吃砒霜

事實:番茄和蝦蟹同食,西紅柿中的維生素C能夠將蝦蟹中無毒的五價砷轉化為有毒的三價砷,也就是人們常說的砒霜。但這只有理論上的可能,浙江省疾病預防控制中心理化毒理所曾經做過模擬實驗,並未發現砒霜。

按照每公斤蝦蟹含0.5毫克無機砷的極限值來計算,即使這些砷能被維生素C全部還原成砒霜,理論上一次只有食用超過100公斤的蝦蟹,才可能發生砷中毒。按照人正常的食量,不存在砷中毒的危險。

謠言六:避孕藥餵螃蟹

事實:謠傳餵避孕藥能使母蟹不變瘦,較為肥美,事實是這將使大閘蟹性腺不發育,蟹黃和蟹膏都沒有了。而且螃蟹對水質要求非常高,加入避孕藥會破壞水質,導致螃蟹死亡。

謠言七:大閘蟹靠激素(荷爾蒙)養肥

事實:螃蟹屬於低等無脊椎動物,激素根本起不了任何作用,且會抑制其性腺發育,反而導致螃蟹的蟹黃和蟹膏變少。

謠言八:大閘蟹抗生素餵食超標

事實:投放抗生素會破壞蟹生存的水質,容易導致蟹死亡。為了預防大閘蟹生病,創造良好的水質,養殖戶會在池塘內養殖水草,利用生物調節,保障水質健康。

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商品網址: Modern Labor Economics- Theory and Public Policy (GE) 12-e

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