At least 13 central banks bought dollars in the foreign exchange market.

Eventually, they must buy dollars, and will try to make money doing so.

He was making a regular run, to buy dollars on the black market.

Now there is not much time to do that before the end of the year, so they started to buy dollars.

So trying to guess when to buy dollars is extremely difficult.

"There were people with a genuine need to buy dollars."

"People are just buying dollars and waiting until things clear up."

In times of trouble, the Mexican middle class has always bought dollars.

They finally had to buy dollars to protect themselves against heavy losses.

This restrictions to buy dollars led to an increase in black market activity.