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The level of variable cost is influenced by many factors, such as fixed cost, duration of project, uncertainty and discount rate. An analytical formula of variable cost as a function of these factors has been derived. It can be used to assess how different factors impact variable cost and total return in an investment. [5]
In economics, average variable cost (AVC) is a firm's variable costs (VC; labour, electricity, etc.) divided by the quantity of output produced (Q): = Average variable cost plus average fixed cost equals average total cost (ATC): A V C + A F C = A T C . {\displaystyle AVC+AFC=ATC.}
The marginal cost can also be calculated by finding the derivative of total cost or variable cost. Either of these derivatives work because the total cost includes variable cost and fixed cost, but fixed cost is a constant with a derivative of 0. The total cost of producing a specific level of output is the cost of all the factors of production.
Average variable cost (AVC/SRAVC) (which is a short-run concept) is the variable cost (typically labor cost) per unit of output: SRAVC = wL / Q where w is the wage rate, L is the quantity of labor used, and Q is the quantity of output produced. The SRAVC curve plots the short-run average variable cost against the level of output and is ...
A typical average cost curve has a U-shape, because fixed costs are all incurred before any production takes place and marginal costs are typically increasing, because of diminishing marginal productivity. In this "typical" case, for low levels of production marginal costs are below average costs, so average costs are decreasing as quantity ...
CVP is a short run, marginal analysis: it assumes that unit variable costs and unit revenues are constant, which is appropriate for small deviations from current production and sales, and assumes a neat division between fixed costs and variable costs, though in the long run all costs are variable.
Notice that w (average unit production cost) includes the fixed and variable costs. The square brackets contain the cost of goods sold, wq not cost of good made wx where x = cost of good sold. To show cost of good sold, the opening and closing finished goods stocks need to be included The profit model would then be:
In the simplest case, where cost is linear in output, the equation for the total semi-variable cost is as follows: [6] = + where is the total cost, is the fixed cost, is the variable cost per unit, and is the number of units (i.e. the output produced).