The removal of plastic mulch also contributes to a higher cost through additional labor and equipment needed.

Since most specialty models, like the convertibles, carry high prices, the cost of the additional labor is covered.

At low production levels the AP tends to increases as additional labor is added.

They needed additional labor to work in the mines.

The teachers, however, being poorly paid, refused to accept the additional labor without remuneration.

Not only that, they are also believed to have a higher economic utility as they can provide additional labor in agriculture.

The children assisted in the operation of the family farm and no additional labor was employed.

Other sub-contractors are used on site for specialist work or additional labour.

About 520 employees are required to staff the entire federal complex with additional labor provided by the minimum-security camp.

In many cases they were specifically invited, as additional labour was needed to help rebuild postwar Britain.