终极抹除者打火机:谁能翻译下面这段话

In industries such as automobile, food and fashion, manufactures often use agents or brokers to sell to wholesalers, retailers or both. Agents work as manufacturers’ sales representatives on a relatively permanent basis, while brokers work as go-betweens for sellers and buyers on a deal-by-deal basis. They are paid in the form of commission, which is usually a certain percentage of the sales realized due to their service.
In making decisions whether or not to launch a new product, an important tool is the break-even analysis. When making this type of analysis, a chart is used to show total cost and total revenue, both depending on the total unit sold. If the total units sold are such that the total revenue exceeds the total cost, profits are realized. If total number of units sold is so small that the total revenue cannot cover the total cost, losses occur. When the total revenue is equal to total cost, they are said to be at the break-even point.
Many small businesses do their own advertising because financially they cannot afford to use professional advertising agencies. As the firms grow in size and diversify in operations, they tend to hand over the job of advertising to professional ad agencies, which serve them in all phases of advertising: writing the script, creating artwork and selecting the media. As such agencies specialize in this field, they normally do a better job in advertising, particularly in artwork. All this, of course, is not done for nothing. The clients have to pay commissions to the agencies, which are usually 10% to 20% of the cost of the ads.