ON EDUCATIONAL COSTS
ON EDUCATIONAL COSTS:
Fixed, Quasi-fixed and Variable Costs
OVERVIEW OF K¨C12 COSTS
? Fixed costs do not vary with enrollment levels
(examples include purchasing, or renting, and
maintaining a building; utilities; amortization of
debt service; and land purchases)
? Variable costs change with fluctuations in
enrollment, both increases and decreases. As
enrollment increases, so do variable costs.
Likewise, a reduction in enrollment will lower
variable costs. A few examples include textbooks
and supplies, software licenses, salaries and
benefits for school personnel, and supplies for
food services
Fixed costs: Fixed costs are costs that do not vary
with enrollment levels. A few examples include
purchasing (or renting) and maintaining a building;
utilities; amortization of debt service (e.g. bonding
for pensions or capital); and land purchases.
The figure below depicts an example where all costs
are fixed and none are variable. To educate the first
student, a school must be built, a teacher hired, etc.
Let¡¯s say this cost is $10 million. If all costs are fixed,
then regardless of enrollment, $10M must be spent.
That is, the cost to educate 50 students or 500
students is the same ($10M).
All Costs Are Fixed
? Quasi-fixed costs are costs that are fixed for
a certain number of students but change after
reaching a certain enrollment. Teachers provide
a basic example
$18,000,000
$16,000,000
$14,000,000
COSTS
? Enrollment fluctuations are a reality that school
districts everywhere have had to manage, even
before school choice became part of the
education landscape
$20,000,000
$12,000,000
$10,000,000
50 students cost
$10,000,000
500 students cost
$10,000,000
$8,000,000
$6,000,000
? The fiscal impact of school choice programs on
public school districts is determined by how
much of school costs are variable.
? In the short run, some costs are fixed and other
costs are variable or semi-fixed. In the long run,
all costs are variable.
TYPES OF EDUCATIONAL COSTS
When disaggregating the fiscal impact of school
choice programs, a key determining component
of the impact on public school districts lies in
how much of school costs are variable. Having an
understanding of these basic economic principles
is critical to grasping the potential fiscal impacts
of school choice policies. Let¡¯s start with a few
definitions, defined in the context of education.
$4,000,000
$2,000,000
0
0
25
50
75
10
0
12
5
15
0
17
5
20
0
22
5
25
0
27
5
30
0
32
5
35
0
37
5
40
0
32
5
45
0
47
5
50
0
52
5
KEY POINTS
ENROLLMENT
Variable costs: Variable costs are costs that change
with fluctuations in enrollment. As enrollment
increases, so do these costs. Likewise, a reduction
in enrollment will lower variable costs. A few
examples include textbooks and supplies, software
licenses, salaries and benefits for school personnel,
and supplies for food services.
The figure below depicts an example where fixed
costs equal $1.3 million and the cost to educate each
student is $10,000. The cost to educate one child is
$10 million (the cost to get the school built, staffed,
and running). The additional cost for educating 100
students will be ($10,000 x 100 = ) $1M, and the total
cost will be fixed costs plus variable costs, or $10M +
$1M = $11M total.
With Fixed and Variable Costs
wishes to enroll, then another teacher will need
to be hired. The cost to educate 31 students is now
$100,000, but additional students can enroll without
needing to hire an additional teacher. If enrollment
reaches 150, six teachers will need to be hired.
$20,000,000
Quasi-fixed Costs
$18,000,000
$14,000,000
$300,000
$12,000,000
$250,000
$10,000,000
$200,000
$8,000,000
$150,000
$6,000,000
$100,000
$4,000,000
$50,000
$2,000,000
0
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
10
0
10
5
11
0
11
5
12
0
12
5
13
0
13
5
14
0
14
5
15
0
$16,000,000
$350,000
0
0
Cost
70
0
65
0
60
0
55
0
50
0
45
0
40
35
10
0
15
0
20
0
25
0
30
0
0
50
0
Cost
Quasi-fixed (or semi-fixed) costs: Quasi-fixed
costs are costs that are fixed for a certain number
of students but change after reaching a certain
enrollment. Teachers provide a basic example.
Educating one child requires fixed costs plus a
teacher. An additional student enrolling (assuming
she¡¯s in the same grade) can be taught by the same
teacher. At some point, however, increasing student
enrollment will necessitate hiring an additional
teacher.
Transportation provides another example of a
quasi-fixed cost. Transporting one student requires
purchasing a bus. Transporting two students can be
done with the same vehicle. An additional vehicle will
be needed at some point with increasing students.
Note, however, that transportation represents a
quasi-fixed cost in another sense. As enrollment
changes, bus routes can also be adjusted in order to
economize on vehicles¡¯ wear-and-tear and fuel.
Other quasi-fixed costs might include administrative
personnel and services, staff, certain equipment or
supplies, or food service.
The figure below illustrates an example of
educational costs with respect to teachers, where 30
students can sit in each classroom in a school. Hiring
the first teacher costs $50,000, and she can educate
30 students in a classroom. If an additional student
WHAT THIS MEANS
Observe that, at some point, some fixed costs
become at least partially variable (as the
transportation example illustrates). When small
numbers of students leave, budgets should be
manageable, especially given that school spending
across the United States has increased four-fold
since the early 1970s (after adjusting for inflation).
As more students leave, however, budgets can still
be manageable because more costs become variable
with larger changes in enrollment. In other words,
this implies the following fundamental economic
principle:
All costs become variable in the long run.
In the immediate short run, all costs are fixed (e.g.
the first day a school is built). In the long run, all
costs become variable (e.g. after most students
leave a school, schools could consolidate and sell
an empty building). In between, there is a spectrum
where fixed and variable costs mix together.
Economist Ben Scafidi (2012) estimated variable
costs for K-12 public schools using data from the
U.S. Department of Education. Based on these data
and a conservative approach to accounting for these
costs, he estimated that about 64 percent of all costs
are variable, on average.
To be sure, the share of total costs that are variable
will vary by state, district, and school. There are
economies of scale at play. In general, smaller
schools or districts will usually have higher shortrun fixed costs per student than larger schools
or districts. Regardless of district size, however,
when students leave public schools, it¡¯s true that
revenue declines, and this can sometimes create a
challenge for district financial planners. But, the
district is relieved of responsibility for educating
these students and subsequently have increased
flexibility in their budgets to find commensurate
cost savings. This can result in overall net savings,
but districts must still make decisions to cut costs.
School Operating Costs and Revenue
REVENUE / COSTS
Revenue
0
0
15
0
14
0
13
0
12
0
11
10
90
80
70
60
50
40
30
20
10
Costs
ENROLLMENT
Cost
Revenue
Enrollment fluctuations are part of the education
landscape as students enter and leave districts
freely, and school districts have long been able to
manage such changes. Budget fluctuations ¨C such
as those that accompany changes in enrollment ¨C
presents a challenging economic reality that many
actors in our society (e.g. households, grocery
stores, small business, governments at all levels,
private schools, and universities) must deal with on
a regular basis.
OTHER CONSIDERATIONS
If one believes that an educational program such as
a school choice program might fiscally harm a school
district because of high fixed costs, then there would
be little need to fund enrollment growth for that
district because all its costs are fixed ¨C it wouldn¡¯t
matter if enrollment increased (or decreased) by 5
students, 50 students, or 500 students.
If, on the other hand, all of a district¡¯s costs are
variable, then funding for that district can increase
or decrease proportionally with enrollment.
With respect to K-12 education funding, neither of
these scenarios is true. Reality is that some costs
are fixed and some costs are variable. When one
or several students leave a given district, their will
likely be a net cost incurred in the very short run.
But this is not a new phenomenon, and it is highly
unlikely that a few students choosing to leave will
inflict an undue fiscal burden. In most cases, they
represent perhaps several thousand dollars in a
multi-million-dollar budget, and districts have long
been accustomed to families entering or leaving its
schools for a variety of reasons. As larger numbers
of students leave, then the variable costs savings
will increase as school districts will face more
opportunities to economize. This works the other
way as well (i.e. when districts face enrollment
increases).
School districts have dealt with economic reality
from changing enrollments ever since they have
existed; school choice programs may slightly add
to the fluctuation of student enrollment, but an
overwhelming number of American families are
still choosing schools based on ZIP Code.
To be sure, dealing with budget changes is
uncomfortable and challenging for anybody,
including public officials. The relevant question is
whether administrators can and should be expected
to handle such challenges without harming
students, and whether the benefits associated with
expanding educational options for children will
exceed the ¡°costs¡± associated with any challenges
administrators might face in managing their
budgets.
Martin F. Lueken, Ph.D.,
Director of Fiscal Policy and Analysis
March 26, 2017
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