At some point, there is no net benefit from further increased span.

Thus its net benefit to owners and management ended up being small or negative.

Others, however, find a net benefit, though most see it as relatively modest.

As income goes up, net benefits get smaller - even negative.

As a result, they get a higher net benefit, on average, no matter what the wage level.

At the $95,000 wage level a married person could be a big winner - getting net benefits of about $165,000.

People who do not live long after retirement age get a much lower net benefit.

Treatments must represent 'value for money' and a net benefit to society.

The amount they receive in net benefits from the Union will fall.

But the net benefits could be $15 billion a year or more.