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A current size or a river size designates a period-referred size. The term stands contrary to the term inventory size, which a time-referred size designates. Current sizes are responsible for changes of associated inventory sizes over the time, whereby each current size cannot be assigned in meaningful way an inventory size. A measure for current sizes is the rate.
Frequent use finds the term in the economy. Characteristic numbers are divided in river sizes and inventory sizes. River sizes can meaningfully temporally aggregated, therefore to be consolidated. For example the daily turnovers add themselves to the monthly turnover. One speaks also of aggregation (summation).
Examples
- The income is a current size, since it always refers to one period. An indication like "its income amounts to 1,000 "" is to be only understood, if additionally one indicates, for which period it is paid. Is it weekly wages, monthly earnings or the yearly The fortune corresponds to the income, as far as it is saved, as inventory size. The latter is indicated to a deadline, is thus time-referred. The saved income is one of the current sizes, which cause changes of the inventory size "fortune" over the time. The part of the income, which serves the financing of the consumption, does not enter against it fortune.
- Conversion and costs are economical current sizes.
- The number of the persons employed is an inventory size, the number of the entrances into the occupation a current size.
- The capital stick is an inventory size; its change in timing is caused by the current sizes investments and writings-off.
- The total population is an inventory size. Their change results from the current sizes number of the births, number of the deaths, number of the Zuwanderungen, number of the drifts.