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

Ofcom decided that the price limit would be linked to the rise allowed for regular second-class stamps.

BBC: Price cap for parcels confirmed by mail regulator Ofcom

This should limit the pool of potentially successful litigants to younger non-smokers who did regular exercise and so on, says Mr Schwartz.

ECONOMIST: Big trouble for Merck

The centreboard problem is largely under control and temporarily repaired, and the crew made a temporary repair to limit the water ingress but they still have been taking water since, and need to maintain a regular routine pumping out.

UNESCO: EDUCATION