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建设行政管理部门对建设工程合同争议进行调解，施工单位不服，施工单位可以采取的行为是()。【2007年考试真题】
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经理补偿金方案规定公司股价超过一定水平，经理每年可从1000美元中获得1美元奖金。为什么说这一协议类似于向经理发行一份本公司股票的看涨期权？
证明对于给定的一种股票。其到期日相同的两种期权。两平的看涨期权费用高于两平的看跌期权费用。(提示：利用看涨期权与看跌期权的平价关系)
This month, the United Nations Development Program made water and sanitation the centerpiece of its flagship publication, the Human Development Report.
Claims of a "water apartheid," where poor people pay more for water than the rich, are bound to attract attention. But what are the economics behind the problem, and how can it be fixed？ In countries that have trouble delivering clean water to their people, a lack of infrastructure is often the culprit. People in areas that are not served by public utilities have to rely on costlier ways of getting water, such as itinerant water trucks and treks to wells. Paradoxically, as the water sources get costlier, the water itself tends to be more dangerous. Water piped by utilities - to the rich and the poor alike - is usually cleaner than water trucked in or collected from an outdoor tank.
The problem exists not only in rural areas but even in big cities, said Hakan Bjorkman, program director of the UN agency in Thailand. Further, subsidies made tolocal water systems often end up benefiting people other than the poor, he added.
The agency proposes a three-step solution. First, make access to 20 liters, or 5 gallons, of clean water a day a human right. Next, make local governments accountable for delivering this service. Last, invest in infrastructure to link people to water mains.The report says governments, especially in developing countries, should spend at least 1 percent of gross domestic product on water and sanitation. It also recommends that foreign aid be more directed toward these problems. Clearly, this approach relies heavily on government intervention, something Bjorkman readily acknowledged. But there are some market-based approaches as well.
By offering cut-rate connections to poor people to the water mainline, the private water utility in Abidjan, Ivory Coast, has steadily increased access to clean water, according to the agency&39;s report. A subsidy may not even be necessary, despite the agency&39;s proposals, if a country can harness the economic benefits of providing clean water.
People who receive clean water are much less likely to die from water-borne diseases - a common malady in the developing world - and much more likely to enjoy long, productive, taxpaying lives that can benefit their host countries. So if a government is trying to raise financing to invest in new infrastructure, it might find receptive ears in private credit markets - as long as it can harness the return. Similarly, private companies may calculate that it is worth bringing clean water to an area if its residents are willing to pay back the investment over many years.
In the meantime, some local solutions are being found. In Thailand, Bjorkman said, some small communities are taking challenges like water access upon themselves. "People organize themselves in groups to leverage what little resources they have to help their communities," he said. "That&39;s especially true out in the rural areas. They invest their money in revolving funds and saving schemes, and they invest themselves to improve their villages. "It is not always easy to take these solutions and replicate them in other countries, though. Assembling a broad menu of different approaches can be the first step in finding the right solution for a given region or country.
为什么拥有一家公司的债券类似于卖出一份看跌期权？如果是看涨期权呢？
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