How do personal saving contribute to the economy

Explanation:

A rise in the savings ratio can have a very significant impact on economic activity. ... If people save more, it enables the banks to lend more to firms for investment. An economy where savings are very low means that the economy is choosing short-term consumption over long-term investment.

Helps you to a goal long term

Explanation:

Savings and Economic Growth. By investing in such saving schemes, the individuals can save a considerable amount of tax. The governments in return invest thus earned capital in various development projects of the country that help to build a better economy. This also helps for the growth of economy.

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When the real exchange rate rises D) exports will decrease and imports will increase.

Explanation:

Exchange rate -

Exchange rate is defined as the number of unit of one of the currency exchangeable for the one unit of another .

The change in the exchange rates can alter the international price of the goods as -

Hence ,  

If the value of dollar exchange rate rises , the relative price of the  domestic goods  will also rise while the relative price of the foreign goods and services will reduce .

Therefore ,

The change in relative prices will reduce U.S. exports and rises its imports.