Ratcheting up the time limit on a regular basis becomes a reasonable way of approximating that perpetuity.

ECONOMIST: Why the rules on copyright need to return to their roots

However, in recent years development has helped limit this and boost far more regular trading.

BBC: Bangladesh bids to boost trade with Burma

This resolution could limit military action to just Iraq, require regular reports to be made to Congress on the progress of the campaign and encourage diplomacy through the UN.

ECONOMIST: We will prevail | The