The phrase "an extra unit" is correct and usable in written English.
It can be used when referring to an additional item or component in a quantity or measurement context.
Example: "We need to order an extra unit of the equipment to ensure we have enough for the project."
Alternatives: "an additional unit" or "one more unit".
Marginal-cost pricing, in economics, the practice of setting the price of a product to equal the extra cost of producing an extra unit of output.
By using linear accelerators retrofitted with cone attachments, hospitals expanded their pool of patients without having to buy an extra unit.
According to this theory, because of heavy population pressure on land, the marginal product of labour (that is, the extra output derived from the employment of an extra unit of labour) was reduced to zero or to a very low level.
That indicates the change of p with an extra unit of attribute or variable x.
In fact, the shadow price indicates the change in the farmers profit with an extra unit of allocated water resource.
Reinforcement encourages increasingly higher consumption because individuals continually derive satisfaction from consuming an extra unit of a good.
If costs are higher and outcomes are better then an incremental cost-effectiveness ratio will indicate the extra costs incurred to produce an extra unit-improvement in quality of life.
As a result, the extra unit of water allocated for these farms increased the profit by 0.432, 0.023, 0.67, 1.25, 0.29 and 0.29 $US, respectively.
A few extra units are added to optimise contrast and reach a sufficient number of units to be able to recruit 1000 participants in each city (30 participants per units).
Isis is not going to be defeated by extending RAF bombing to Syria or sending in an extra SAS unit, or a drone strike on a low-ranking foreign recruit fluent in English.
With this control scheme a coprocessor can execute its instructions out of order without an extra hardware unit for out-of-order execution control.
