题目内容
（请给出正确答案）
Question 3
A plastics monopolist faces the demand curve P=180 - Q, where Q is measured in thousands of pounds per year and P is measured in dollars per pound. Marginal cost is constant at MC=＄60 per pound.
(a)Find the monopolist's profit-maximizing price and quantity.
(b)What is the elasticity of demand at the profit-maximizing price？
如果结果不匹配，请 联系老师 获取答案
更多“Question 3A plastics monopolis…”相关的问题
everyday products such as beverage containers, toys, and furniture.The widespread use of plastics demands proper disposal of plastic waste.Plastics make up almost 13 percent of the urban solid waste stream, a dramaticincrease from 1960, when plastics were less than one percent of the wastestream. The largest category of plastics are found in containers and packaging(e.g. soft drink bottles, lids, shampoo bottles), but they are also found indurable (e.g. appliances, furniture) and nondurable goods (e.g. diapers, trashbags, utensils, and medical devices）. The recycling rate for different types ofplastics varies greatly, resulting in an overall plastic recycling rate of only8 percent, or 2.7 million tons in 2011.
Currently, the UShas the capacity to recycle plastics at a greater rate as a latest technologyhas come into being that helps in converting plastic waste disposal intoa good source of green fuel. A new process for turning plastics into fuel wasinvented. First, many different kinds of unwashed plastics are melted together.Then a special chemical is used to turn the fluid into a vapor（蒸汽）. Thisreduces the plastic to its most basic elements to make it have a high fuelvalue. It is tested that 86 percent of what goes in comes out as fuel. And 8percent of the recycled plastic is used to run the system. This technology willreduce the country’s dependence on foreign oil and theamount of plastic waste in its landfills（垃圾填埋场）．
Scientists sayplastic-to-oil technology is still new and developing. They say it is not yetknown if the process is environmentally friendly. And some question whetherturning plastics into oil can even be considered “recycling”.Carson Max is with the publication Resource Recycling, a magazine that reportson the plastic recycling industry. He says because there is a lot of plasticwaste and a great demand for oil, the recycling technology may create greatchanges in both industries. “So they’re getting value from something that would otherwise go to thelandfill, things that wouldn’t be accepted into a recycler.”
26. According to the article, the great increase in use ofplastic goods requires_______.
A. richer source of green fuel
B. more categories of durable plastics
C. faster development of plastic products
D. more efficient disposal of plastic waste
27. The word “converting” inParagraph 2 most probably means “_______”．
A. coloring
B. inventing
C. consuming
D. transforming
28. What will the plastic-to-oil technology result in？
A. Less dependence on imported oil
B. Increase in plastic waste
C. Production of more plastic goods
D.Disappearance of landfills
29. What is Carson Max’s attitude towards the plastic-to-oiltechnology？
A. Positive
B. Negative
C. Critical
D. Indifferent
30. What is the passage mainly about？
A. The important function of plastics in everyday life
B. The new technology of plastic waste disposal
C. The development of plastics industry
D. The categories of plastics
The new law poses a few challenges to manufacturers who are now rushing to set up collection networks and perfecting techniques to disassemble and recycle older products.With an eye toward the future, they are also integrating easily recycled materials into new products. Plastics, a major component of most electronicproducts,pose a particular obstacle because their quality becomes worse and worse with age,losing strengthand flexibility even if reprocessed.NEC Corp. overcomes this problem by creating a plastics sandwich, in which the filling is 100 percent recycled plastic and the outer layers a mixture of 14 percent recycled material.The resulting plastic has sufficient strength and toughness for use as a case for desktop PCs. The company, in cooperation with plastic maker Sumitomo Dow, has also developed a new plastic, which engineers claim retains its mechanical properties through repeated recycling. NEC uses the plastic, which is also flame-retardant (阻燃的) in battery cases for notebook PCs.
Meanwhile, Matsushita Electric, maker of the Panasonic brand, is avoiding plastic in favor of magnesium (镁). Magnesium, says the company, is ideal for re cycling because it retains its original strength throughrepeated reprocessing. Matsushita has developed molding techniques to form. magnesium into the case for a 21-inch TV. Unfortunately, the magnesium case and energy-saving features make the TV about twice as expensive as an ordinary model.The company hopes, however, that increased use of magnesium will eventually bring prices down.
Choose correct answers to the question:
According to the present regulations of Japan, the recycling of paper and plastic will be the responsibility of______.
A.the government
B.the manufacturers
C.the consumers
D.the sellers
The first question is how best to separate clean element -- glass containers, plastics, and some paper and metal containers that is relatively clean when discarded -- from mixed refuse. This clean element is the main target for Britain's recyclers. The method of collection is important because manufacturers will not reuse collected material unless it is clean and available in sufficient quantities. A bewildering assortment of different collection schemes operates in the rest of Europe, and pilot schemes are now under way in many British cities.
A realistic target for recycling mixed refuse is somewhere between 15 and 25 percent by weight, according to researchers at the Department of Trade and Industry's Laboratory. Statistics compiled by researchers at the University of East Anglia show that Britain could almost halve(减半)the total weight of domestic waste going to landfill by a combination of "collect" schemes(such as doorstep collections for newspapers), "bring" schemes(such as bottle banks)and plants for extracting metals.
This estimate makes two important 'assumptions. One is that the government will bring in legislation to encourage the creation of markets for products made from recycled materials, especially glass, paper an plastics. The other is that industry will continue to introduce new technology that will improve both the products and the techniques used to separate recoverable materials from mixed refuse.
Which of the following can serve as a proper title for the passage？
A．An Impossible Target
B．Government Assumptions
C．Recycling Britain
D．Categories of Britain's Waste
______ of plastics, the machine works perfectly.
A．Being made
B．Having made
C．Made
D．To be made
Plastics is a kind of______ which is widely used in industry nowadays.
A．mass
B．substance
C．matter
D．material
________ is Japan\'s biggest plastics group.
A Mitsubishi Kasei B Mitsubishi petrochemical C Mitsui Petrochemical industries
According to the passage, the term “plastic sandwich” refers to_____.
A.a kind of sandwich-shaped toy made of plastics
B.a kind of plastics with different integration in each layer
C.a kind of plastics with maximum strength and flexibility
D.a kind of plastics made of 100% recycled materials
Why do plastics antiques bring a shock to most people'？
A．Because they are very fragile and hard to maintain.
B．Because they might cause certain pollution to environment.
C．Because plastics is so common and easy to find around people.
D．Because people don't take plastics seriously.
______ is Japan's biggest plastics group.
A．Mitsubishi Kasei
B．Mitsubishi Petrochemical
C．Mitsui Petrochemical Industries
Thermoplastic plastics are generally best for which of the following type of service conditions？
A) impact
B) creep resistance
C) chemical exposure
D) flammability
