试描述下列事件对利率、国内储蓄和国内投资的影响(分析封闭经济、小国开放经济、大国开放经济和资本受控制的经济等各种情况)： a．C国发现大批新的石油储量。该储量颇有利可图。但需要5年新的实物投资才能开采出来。 b．D国寒冷的气候迫使大批工厂停工3个月。损失的产量无法挽回，但至春季生产又会恢复正常。 c．新的合成纤维降低了铜的需求量。持久地降低了铜相对于其他货物的价格。试考虑对出口铜的E国的影响。 Describe the effects on the interest rate，domestic savings，and domestic investment of the following events(analyze the cases of a closed economy，a small open economy，a large open economy，and an economy with capital controls． a．Country C discovers large new reserves of oil．The reserves are highly profitable，but it willtake five years of new physical investments to bring them into operation． b．Cold weather in country D forces extensive factory closings for three months．The lost production cannot be recouped，but production returns to normal by the spring． C．New synthetic fibers reduce the demand for copper，permanently lowering its price relativeto other goods．Consider the effect on country E，a copper exporter．