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A decision depends on costs that change between alternatives, not every cost assigned to a program.

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Marginal and incremental analysis separates relevant future differences from totals that will remain the same.

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This episode adapts Kioko and Marlowe's chapter Cost Analysis, published by University of Washington Pressbooks under Creative Commons Attribution 4.0 except where otherwise noted.

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It condenses, paraphrases, and reorganizes the authors' explanatory prose.

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Separately credited cases, examples, figures, tables, quotations, and linked materials are excluded.

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Variable costs move with activity, while fixed costs remain stable within a relevant range and time period.

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Step costs remain fixed until demand crosses a capacity threshold, then jump.

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Over a longer horizon, costs that looked fixed may become adjustable through staffing, leases, or capital replacement.

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Avoidable costs disappear if an activity stops.

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Sunk costs have already been incurred and should not drive the next choice.

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Opportunity cost represents the value of the best alternative use of constrained staff time, space, cash, or equipment.

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These categories are decision-specific rather than permanent labels.

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Build scenarios around service units and capacity.

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Separate volume from price, identify bottlenecks, and test thresholds.

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An outsourcing proposal should include contract management, transition, quality control, retained overhead, and risk, not merely compare a vendor quote with allocated full cost.

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Avoid the average-cost trap.

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Dividing total annual cost by annual units can describe history, but it may not predict the cost of one more unit or the savings from one fewer unit.

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Show the relevant range, time horizon, capacity threshold, and resources that truly change.

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Include implementation delay and reversal cost when an option is difficult to unwind.

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Torrance application segment.

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This original local exercise is separate from the textbook and cites the City of Torrance Budget Documents page, checked October seventh, twenty twenty-six, at torrance C A dot gov slash Government slash Departments Offices slash Finance slash Budget Documents.

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Suppose a hypothetical City service faces higher demand.

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Begin with the current adopted budget and latest review records only to identify authorized resources and the reporting period.

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Model a base case, added-volume case, and capacity-threshold case.

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Separate overtime, materials, contracted capacity, supervision, facilities, and capital.

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Record which costs are avoidable, which remain, and when a step increase occurs.

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This exercise does not claim that any Torrance service has excess demand or recommend staffing, contracting, or capital action.

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The result should show both financial and operational consequences.

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A cheaper option that shifts waits, errors, safety risk, or unpaid work to residents is not equivalent service.

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Marginal analysis is strongest when it states what changes, what does not, and who experiences the difference.

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This adaptation credits Sharon Kioko and Justin Marlowe and is licensed under Creative Commons Attribution 4.0.

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Changes include condensation, paraphrase, reorganization, and a separately sourced Torrance application.

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No author, publisher, or City endorsement is implied.