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Savings effect:

Prices fall, which allows people to buy more, increasing the purchasing power. Because that increased, people don't have to spend as much to get the things they need so they can save more. This lets the bank lend out more and keep interest low because they don't need as much money.

Foreign exchange:

All of the stuff in the first one happens and people have more money to invest. They find that interest rates aren't as high in other countries so they decide to invest there. They have to convert heir currency which depreciates the value of American dollars which makes other countries want to buy from us, so exports increase

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Price level goes down, people's savings and purchasing power goes up, the money supply in banks goes up, rate of interest goes down, investment rates go down.

Price level goes down, interest rates go down,  US currency converted to U.K. currency, causing dollar to drop and pound to go up, causes exports from US to go up.

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Interest rate=  Prices levels do down and the power to purchase ends up increasing and the amount of money in the bank also increases along with amount of power so interest rates go down

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interest rate effect: price level decreases, power of the purse (purchasing power) increases, consumption spending decreases, saving of money increases, lending money increases, interest rate (money returning to bank) decreases

FOREX effect: price level decreases, interest rate (money returning to bank) decreases, American investors change their money into pounds, price of dollar depreciates and pound increases, British buy more American goods (hamburgers!), the rate of American goods going to Britain increases, the rate of British goods (croissants) going to America decreases.

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Interest rate effect: price level decreases, purchasing power goes up

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Explanation here or as comment