Which of the following would supply dollars to the foreign-exchange market?

The sale of U.S. automobiles to a Mexican consumer
The spending of British tourists in the United States
The purchase of Canadian oil by a U.S. refiner
The sale of a U.S. corporation to a Saudi Arabian investor

With freely-floating exchange rates, an increase in tariffs will tend to cause:

imports to increase.
exports to decrease.
a rise in the price of foreign currency.
an outflow of gold.

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