Such an exchange might still happen, but now it seems quaint.

The exchange of mail happened first and took only a second.

For the first few years, the exchange happened in person, and we were always sure to make an occasion out of it.

Scott said that such heated exchanges do not happen often.

A physical exchange happened during the waning moments of the first half between both players.

"If this exchange happens, it means the ice is broken and something more will follow."

"The exchange of bad rubber for good must happen during transit."

The hope is that the next exchange will happen sometime in late 2007 and early 2008.

Finally, since the exchange does not happen at the same time, there is always room for renegotiation.

If anything, it helps produce a more logical picture for why such an exchange would happen.