如果国外爆发了一场战争，它将在许多方面影响美国经济。用大型开放经济模型考察这场战争在下列每一方面的影响

下，美国的储蓄、投资、贸易余额、利率以及汇率会发生什么变动？(为了使事情简单化，分别考察下面每一种影响。)

a．美国政府由于担心自己需要介入战争，增加了对军事装备的购买。

b．其他国家增加了对高技术武器的需求，这是美国的主要出口。

c．战争使美国企业对未来无法确定．而且，企业的一些投资项目被延期。

d．战争使美国消费者对未来无法确定，而且做出的反应是储蓄更多。

e．美国人变得害怕出国旅行，因此更多的人在美国度假。

f．外国投资者在美国为他们的投资组合寻找一个避风港。

If a war broke out abroad, it would affect the U.S. economy in many ways, Use the model of the large open economy to examine each of the following effects of such a war. What happens in the United States to saving, investment, the trade balance, the interest rate, and the exchange rate？ (To keep things simple, consider each of the following effects separately.)

a．The U.S. government, fearing it may need to enter the war, increases its purchases of military equipment.

b．Other countries raise their demand for high-tech weapons, a major export of the United States.

e．The war makes U.S. firms uncertain about the future, and the firms delay some investment projects.

d．The war makes U.S. consumers uncertain about the future, and the consumers save more in response.

e．Americans become apprehensive about traveling abroad, so more of them spend their vacations in the United States.

f．Foreign investors seek a safe haven for their portfolios in the United States.