Suppose the government releases information that causes people to expect that the purchasing power of a money

Question:

Suppose the government releases information that causes people to expect that the purchasing power of a money in the future will be less than they previously had expected. What will happen to the today? Why?

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...