A medium is a way of getting a message to someone who should know about something.Advertising is just one medium.Advertising is called a communication medium or a promotion medium.
注釋：
1.advertising 做廣告
2.prospective customer 潛在顧客
3.promotion program 促銷計劃；促銷手段
譯文
廣告促銷
“人們不會買自己不了解的產品”，馬丁說。他又補充道：“我們的工作就是要確保那些使用我們產品的公司或個人了解產品。”馬丁是公司的廣告經理。不過，他和他的員工們不隻是為公司的產品做廣告。馬丁聲稱：“我們銷售自己稱為公司形象的東西以及這個形象帶來的產品質量。”他解釋道他這個部門的工作就是要確保顧客和潛在顧客知道公司的名稱和產品。
銷售公司的形象和產品十分重要，形象是人們頭腦中的公司或產品。人們通過聽和讀了解公司其及產品，從而構成形象。
史蒂夫同意這種說法。他說要訪問那些從來沒聽說過公司名字的潛在顧客並向他們進行推銷是十分困難的。“人們從未聽說過你們的產品，也不了解你們公司，就不敢向你們購買。”
史蒂夫說這種情況他並不經常碰見。他訪問是因為絕大多數人都聽說過他的公司，而且其中很多人都了解公司生產的產品種類。“情況應該如此。”史蒂夫感覺到了。“如果顧客和潛在顧客已經知道我們是誰，我們生產什麼產品，我就可以集中精力談論顧客的需求以及產品將會給他們帶來什麼好處。”這就是銷售員的工作。他接著說：“向朋友推銷比向陌生人推銷更容易。廣告和其他促銷手段就是在為我們結交朋友。”
馬丁同意史蒂夫的說法。他說要使人們了解公司及其產品不僅僅是靠廣告。廣告隻是用以介紹公司及其產品的多種“媒介”之一。公司使用多種媒介，而“媒介”在這裏用作複數，即不隻一種“媒介”。
一種媒介就是一種使人們了解情況的信息傳輸方式。廣告隻是一種媒介，它稱為交流性媒介或促銷媒介。
(3) The ABCs of Market
市場ABC
A market is commonly thought of as a place where commodities are bought and sold.Thus fruit and vegetables are sold wholesale at Covent Garden Market1 and meat is sold wholesale at Smithfield Market2.But there are markets for things other than commodities，in the usual sense.There are real estate markets，foreign exchange markets，labour markets，short-term capital markets，and so on； there may be a market for anything which has a price.And there may be no particular place to which dealings are confined.Buyers and sellers may be scattered over the whole world and instead of actually meeting together in a market place they may deal with one another by telephone，telegram，cable or letter.Even if dealings are restricted to a particular place，the dealers may consist wholly or in part of agents acting on instructions from clients far away.Thus agents buy meat at Smithfield on behalf of retail butchers all over England； and brokers on the London Stock Exchange buy and sell securities3 on instructions from clients all over the world.We must therefore define a market as any area over which buyers and sellers are in such close touch with one another，either directly or through dealers，which the prices obtainable in one part of the market affect the prices paid in other parts.