revenue stream
a source of income received over time from the sale of a product
fixed costs
costs that do not vary with output or sales in the short term
variable costs
costs which vary with output
direct costs
costs that can be clearly identified with each unit of production and can be traced back or allocated to a cost centre
indirect costs
costs which cannot be identified with a unit of production or allocated accurately to a cost centre, also known as overhead costs
revenue (or sales turnover)
the value of sales made during the trading period = selling price * quantity sold
total revenue
total income from the sale of all units of a product during a given time period