Step-by-step explanation:
There could be two scenarios. One is the decrease of Dollar with itself and its impact on its economy and second is the decrease of dollar with respect to other currencies.
So if dollar decreases with respect to itself, it means the value of the currency decreases. When the currency depreciates, people will have to pay more to purchase the same product, which means there will be more money circulation within the economy. Prices of the products or services increases which results in the inflation within the economy.
Secondly if the currency decreases against the other country's currency, it means the other currency is getting strong against your currency. You may face to bear more amounts of money for trading with other countries. Imports will be more expensive.