In his address, the Pope called for "a truly open exchange."

The goal does not seem to be the sort of clear and open exchange that we might expect.

Indeed, the points of view and the open exchanges on campuses have led the way in shaping national debates.

"What we are trying to do," he said, "is establish an open exchange."

Making a case would be very difficult because determining the Libor rate does not occur on an open exchange.

This call is going through three open exchanges, Bernie told him.

I also believe that the university is a place for the free and open exchange of ideas.

It should be an open and frank exchange of ideas.

An open and constructive exchange of views is needed in Turkey, including the most sensitive issues.

This free and open exchange was unimaginable in their society.