ECONOMICS What is an exchange rate?
A. The increase in the price of goods over time
B. The value of one currency relative to another
C. The total value of a country's imports and exports
D. Any form of money used to pay for goods

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.