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English Pages [480] Year 1961–1965
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INDUSTRIAL DYNAMICS
,,l inventory
' 1 AR (units) lunlsl #1 +61
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_ .. 1500
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- 13 Factory orders F.cl.,y distributors RRF (units /week) (units/week)\
tt
from t31
/ ' Factory
%
output SRF t20 % output SRF +200/. (units/week) +38% \ '
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tt?N _ \
:
= 2?3 p roduction
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/-20% \ l'
,
Pr°duction
w\ \ ' Retail sales RRR (units/week) \ pistributor IAF Factory inventory orders or from (units) \ RRD retail (units/week - 23
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NNNt
Manufacturing orders to factory
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-62
,
%
% -
, warehouse Factory average order-filling
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2.6-week order - filling deloy
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(un'ts) 7 2 weeks' .roduction
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delay DFF (weeks)
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Factory warehouse untilled orders UOF *40.0 (units) \
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Distributory
70 2nd
- 55
MOF (units/week)
Dec
Feb Apr Jun Auq Oct
Limited Factory Capacity. So far we have considered only simple situations. Additional realities of company operation can be added as needed. In the preceding exhibits we assumed that the factory was able to produce at whatever level was desired. In a more realistic situation, with limited factory capacity, some surprising new effects develop. Figure 2-5 shows the effect of a maximum factory capacity limit that is 20% above the average sales level. As before, the system is completely stabilized at the beginning of the first year; then it is assumed that retail sales rise and fall 10% during each year. Retail sales never reach production capacity. Yet because of the inventory and pipeline effects, distributor orders to the factory do exceed its capacity. Furthermore, as factory deliveries
year
Feb Apr Jun
become slower, distributors begin to order further in advance of needs, and still more orders are put into the system. As a result the factory operates at full capacity for three months during the first year. Then inventory demands are filled at a time that coincides with falling retail sales. In the last half of the year, falling retail sales and inventory liquidation combine with the reduction of in-process orders which results from improving delivery. In the third quarter we see a combination of rapidly falling factory orders, a swiftly declining backlog of unfilled orders, and a suddenly rising factory inventory. The natural result is to curtail production from its maximum level, here falling to 62% below normal. Unlike the first year, the system now enters 30
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Figure
Effect of
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limited level.
,/ MOF
factory limited
3
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sales on fluctuating retail with manufacturing capacity to 20% sales 20% above average ,
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,i A RRR
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RRD \ A
-RRF /
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is
to
ventory
is
°.
excess
of
'
drops
at
a level
of
i
sharply Factory
output
to
below
79%
below
second
year below
production and
inventory is
year
that
come
slow.
pacity
for
In deliveries,
is
than
been
spite
of note
and 6 In
that
less
factory retail
from
the
weeks the
of
from than
factory, agement
to
inventories
a period
at
-
plans
reached
the
man-
lead
easily
expansion never
sales
was
backlog
circumstances might
undextake
from
9 months
order
the
condition
ca-
inventory
year, for
level;
the
may
production
second
August
that
occurrence
overexpand
from
retail
though
àn
entire
until
the
even
production
capacity. the
Explaining is
ganization
factory 4
quate of
and
produces
for
polioperating much as will act
system
desired
ca-
a week.
inventory
For
this
normal
sales
unless
2-5 to
below the
rising.
production
the
suspended and
year.
Figure
the
Viewed
a back-
meantime,
second in
November
rise
factory
represent
depleted to
low
at
orders
nearly
production
demand
full
remaining
'
the
company
pacity.
be-
at
a
was
the
see
lead
distributors' deliveries
in
We
broadened
runs
meet
normal
normal. has
inventory weeks'
to
a
when
production
months
rise
normal
years,
are chapged,
it did
second
distributors
succeeding
cies
rising,
the
per-
the
by
with
first-year
show
ahead
above
which
higher
the
from
sustained
Unfilled
345%
orders in
and
Factory 6
distributors.
log
orders
order
to
sales, result of
normal
is
imbalance
of
The
accentuation
above
tendency
state
average
Factory
61 %
peak
to
a
falling.
an
formance. to
in
the
7 week?s.
In the
months
almost
retail
average
'
8
manufactur-
in is
factory
production
sales,
curtailed
orders
the for
sales average
retail
This
unfilled Since
long-run equal
be
months.
and '
down.
necessarily
equal
constant.
which
start
in
must
at
point and
the
4
0
the peak
because
ing
in-
factory
shipments is
inventory
produced
79-
likeli-
inventories
when
peak
81st week
the
and
74, le
1 111.0.
in
has
must
–"" \
their
is little
Retail
a minimum.
orders;
a
sales.
retail
at
there
actually
reach
that
reach
-
that
losing
happen
therefore
'
jY
and
incoming
25
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of
Note
-/
1,
hood
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13 %
[AF
\
.
only
slow
step
deviate
ment
a
the of
représentation particular is
to
control
determine
ways company '
31 1
:
first
_
an
the
cqrrent industry,
to
improve
success.
or-
industrial
step.
or
company
for
of
behavior
only
After
ade-
operations the
next
manage-
2000
11
-=-
11
1
r
Retail Inventory IAR (unifs)
1500 .
+72%
SRF with FaCtory output reduced clerical delays (units/week)
-
Retail RRR
.2 Z)
) Factory output SRF with stcindard - delays delays (units/week)
/
sale (units/week)
/ /"10%
---.
._ .
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1000 ,,, -
Factory inventory [AF (units)
____,_.
; warehouse UOF (units) (units)
Factory orders
,...-...,
unlilled unfilled
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