The phrase "an additional unit" is correct and usable in written English.
It can be used when referring to an extra item or component that is being added to a group or collection.
Example: "To meet the increased demand, we will need to order an additional unit of the product."
Alternatives: "an extra unit" or "one more unit".
The system was scaled up with an additional unit connected in parallel to increase the filtration surface area and the flow speed.
The figure shows the marginal product of capital - the increment to GDP from an additional unit of capital – as a function of the capital stock.
Marginal utility, in economics, the additional satisfaction or benefit (utility) that a consumer derives from buying an additional unit of a commodity or service.
Consumption is also thought to have diminishing marginal utility, i.e. a poorer person will value an additional unit of consumption more than his richer cousin.
This implies that the likelihood of a (rear-end) crash increases by about 8% with an additional unit increase in the standard deviation of speed.
For example, all of the students thought it was straightforward for a firm to set marginal cost (the cost of an additional unit of output) equal to marginal benefit (the revenue from an additional unit of output) in order to find the "optimal" level of output.
The concept implies that the utility or benefit to a consumer of an additional unit of a product is inversely related to the number of units of that product he already owns.
Typically, it concentrates on macroeconomic relations, particularly the ratio of savings to total output and the aggregate capital output ratio (that is, the number of units of additional capital required to produce an additional unit of output).
Thus, suppose that 12 percent of total output is saved annually and that three units of capital are required to produce an additional unit of output: then the rate of growth in output is 12/3% = 4% per annum.
This theory suggests that the utility or value to a consumer of an additional unit of a product is (at least beyond some critical quantity) inversely related to the number of units of that product he already owns.
Rodriguez told reporters before this second stop, which occurred about 13 minutes after Gray was placed in the van, the driver had requested an additional unit to check on Gray, who had been placed in leg irons during the first stop after "acting irate in the back".
