During the synthesis stage of the cell cycle, a cell makes (replicates its own) DNA.
Economic profits equals total revenues minus the sum of explicit costs and implicit costs. Since explicit costs are already subtracted when arriving at the accounting profit, we can find economic profit by subtracting the implicit costs from the accounting profit.
Implicit costs are harder to measure than explicit costs, which makes implicit costs more subjective than explicit ones. Implicit costs help managers calculate overall economic profit, while explicit costs are used to calculate accounting profit and economic profit.