翻译一下内容 大概意思就可以

翻译一下内容 大概意思就可以
Describe the difference between direct demand and derived demand.
ANSWER

Direct demand is consumption demand for goods and services. Direct demand is demand by consumers based on the satisfaction or utility derived from consumption. Derived demand is indirect in the sense that it represents demand by producers based on the usefulness of inputs in the production of goods and services for final consumption. Derived demand arises when it becomes profitable for a firm to use a given input in the production of some other valuable product.



The Energy Department estimates that domestic demand for natural gas will grow by more than 40% between now and 2025. Distinguish between a demand function and a demand curve. What is the difference between a change in the quantity demanded and a shift in the demand curve?
ANSWER

A demand function is a statement of the relation between the demand for a product and all variables (factors) that affect demand. The demand curve, on the other hand, is an expression of the relation between price and the quantity demanded, holding constant the effect of all other demand influencing variables. Movement along a demand curve describes the relation between price changes and the quantity demanded. Shifts in a demand curve or changes in demand indicate the effect on demand of changes in one or more of the nonprice variables in the demand function.



What key ingredients are necessary for the creation of economic supply?

ANSWER

Two basic conditions must be satisfied before economic supply can be created. First, there must be a willingness among producers to supply output. It must be profitable for them to do so. Second, there must be an economic capability for doing so. Thus, firms must be both willing and able before economic supply can be created.

1.阐述直接需求（商业名词）与派生需求（商业名词）的差异.
回答：
直接需求是指对商品和服务的消费需求.直接需求是一种通过消费者对于消费的满意度和实用性的需求.而派生需求则是间接的,某种意义上它代表了生产者对于商品生产和终端消费服务的有效性投入的需求.当有利可图时,公司就会投入生产一些有价值的产品,这是派生需求就出现了.
2.美国能源部估计,从现在到2025年国内天然气需求将增长逾40%.辨别需求函数和需求曲线.需求量变化和需求曲线的改变有什么不同?
回答：
这个需求函数描述了对某种产品的需求和所有影响需求变量(因素)之间的关系.另一方面,需求曲线表达了价格和需求量之间的关系,保持恒定的所有其他需求影响变量.需求曲线描述了价格变化和需求数量之间的关系.需求曲线的改变或需求的变化表明了需求改变将会影响需求函数里一个甚至更多的非价格变量.
3.什么才是创造经济供给的关键要素?
回答：
必须满足两个基本条件才可以创建经济供给.首先,必须有一个意愿生产商提供投入.他们这么做必须有利可图.第二,生产商必须有这样做的经济能力.因此,企业必须既有意愿又有能力才可以创建经济供给.