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xiaohuolu · 2019年11月29日

问一道题:NO.PZ201710020100000207

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问题如下:

7 Based on Exhibit 1, which government policy has been most effective in helping Genovia achieve its second initiative?

选项:

A.

Tax on fossil fuels

B.

Subsidy on hydropower

C.

Subsidy on other renewables

解释:



C is correct. At the end of Year 2, the compound annual growth rate (CAGR) for each sector is calculated as follows: (Year 2/Year 0)0.5 – 1

Fossil fuels = (426/462)0.5 – 1 = –4% Hydropower = (273/186)0.5 – 1 = 21% Other renewables = (154/97)0.5 – 1 = 26%.

The CAGR indicates that the 26% increase in production from the subsidy on other renewables has been more effective than the 4% decrease in production from the tax on fossil fuels or the 21% increase in production from the subsidy on hydropower. Thus, the subsidy on other renewables of 26% is the highest, indicating that this policy has been the most effective in helping Genovia achieve its second initiative.

考点:Regulatory Tools

解析:首先我们根据表格计算一下政府实施政策后,不同发电来源产电的变化。

Fossil fuels = (426/462)0.5– 1 = –4%

Hydropower = (273/186)0.5– 1 = 21%

Other renewables = (154/97)0.5 – 1 = 26%.

从计算结果看,石化燃料发电降低了4%,风力发电增加了21%,其他再生资源发电增加了26%。因此从环保节能的角度而言,其他再生资源收获的效果最大。



使用(year2-year0)/year0再开方,与(year2/year0)0.5-1求出来的值不应该都是年化增长率?为什么选择第二种计算方式?

1 个答案
已采纳答案

源_品职助教 · 2019年11月29日

嗨,从没放弃的小努力你好:


第一种方法下,根号内部可能是一个负数,所以就解不出来实数解。

因此建议用协会推荐的第二种方法。


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