可以解释一下这道题吗用了什么知识点

问题如下：

QuestionNominal foreign exchange rates compared to actual exchange rates:

选项：

A.

show a divergence from the principle of purchasing power parity.

B.Represents the relative price level at home and abroad.
C.

serve as indexes aiding in the comprehension of global trade and financial movements.

解释：

Solution

1. Right. The characteristic of nominal exchange rates is that they can frequently stray from the purchasing power parity (PPP) doctrine.
2. Wrong. It's the real exchange rate that captures the comparative price levels between nations. The concept behind the real exchange rate is that it adjusts the nominal rate in relation to the price metrics of each nation involved in the currency exchange. This adjustment gives insights into the comparative purchasing ability across borders.
3. Wrong. Nominal foreign exchange rates aren't typically framed as benchmarks. Real exchange rates, however, are crafted by experts to shed light on an economy's global competitiveness and the tangible buying power of its currency. From this perspective, real exchange rates offer a lens through which one can analyze patterns in global trade and capital transitions, thus potentially influencing nominal rates in spot markets.

The Foreign Exchange Market and Capital Flows

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A正确，名义汇率的特点是经常偏离购买力平价原则。

B错误,实际汇率反映了国家之间的相对价格水平。实际汇率背后的概念是，它根据货币兑换中每个国家的价格指标来调整名义汇率。这一调整让我们深入了解了跨境的相对购买能力。

C错误,名义外汇汇率通常不作为基准。然而，实际汇率是由专家制定的，目的是揭示一个经济体的全球竞争力及其货币的有形购买力。从这个角度来看，实际汇率提供了一个视角，人们可以通过它来分析全球贸易和资本转型的模式，从而潜在地影响现货市场的名义利率。