The behavior of some scrap learning curves in metal fabrication.  Page 7 
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I ately, according to on© of several possible equations.  The most commonly used equation can be represented graph I ically by a straight line on log log paper, the logarithm \r J of cumulative number of units of output being plotted on I the x scale and the logarithm of average cost per unit j {for the cumulative output) being plotted on the y scale, j There is a constant percentage reduction in the cumulativeJ average labor hours per part each time the quantity is j doubled. Thus, with an nQ0$>n Learning Curve, whenever j quantity, of output is doubled the average number of man hours required per unit for the cumulative total produced, is 80% of the average time per part for the initial j quantity. T. P. Wright was the first person to formulate into ! theory the principles of decreasing direct labor cost as ! the number of airframes produced is increased. Wright was very explicit: This eighty per cent has a definite meaning in thatj it represents the factor by which the average labor cost in any quantity shall be multiplied in order to determine the average labor cost for a quantity of twice that number of airplanes.2 There are several factors that account for the decline in unit airframe cost as output increases. The most commonly Ii11........... .... 2T. P. Wright, “Factors Affecting the Cost of Airplanes,tf Journal of the Aeronautical Science, III (February, 1938), p. 12!+/
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Title  The behavior of some scrap learning curves in metal fabrication.  Page 7 
Repository email  cisadmin@lib.usc.edu 
Full text  I ately, according to on© of several possible equations.  The most commonly used equation can be represented graph I ically by a straight line on log log paper, the logarithm \r J of cumulative number of units of output being plotted on I the x scale and the logarithm of average cost per unit j {for the cumulative output) being plotted on the y scale, j There is a constant percentage reduction in the cumulativeJ average labor hours per part each time the quantity is j doubled. Thus, with an nQ0$>n Learning Curve, whenever j quantity, of output is doubled the average number of man hours required per unit for the cumulative total produced, is 80% of the average time per part for the initial j quantity. T. P. Wright was the first person to formulate into ! theory the principles of decreasing direct labor cost as ! the number of airframes produced is increased. Wright was very explicit: This eighty per cent has a definite meaning in thatj it represents the factor by which the average labor cost in any quantity shall be multiplied in order to determine the average labor cost for a quantity of twice that number of airplanes.2 There are several factors that account for the decline in unit airframe cost as output increases. The most commonly Ii11........... .... 2T. P. Wright, “Factors Affecting the Cost of Airplanes,tf Journal of the Aeronautical Science, III (February, 1938), p. 12!+/ 