Lesson preview · Production Technology
Short Run vs Long Run
~5 min · Free to read
In economics, the short run and long run aren’t about clock time — they’re about which inputs the firm can adjust. The short run is any period in which at least one input is fixed. The long run is when all inputs are variable.
Key Term
Short Run vs Long Run
Short run: At least one input is fixed (usually capital). The firm can hire/fire workers but can’t build a new factory overnight.
Long run: All inputs are variable. The firm can change plant size, technology, location — everything is adjustable.
The distinction is about flexibility, not calendar time.
How long is the “short run”? It depends on the industry. For a lemonade stand, the long run might be a week (buy a bigger cart). For an auto manufacturer, building a new factory takes years. For a software company, scaling servers might take hours. In the short run, the firm’s production decisions are constrained by its fixed inputs.
In the short run, capital K is fixed (denoted with a bar). In the long run, both L and K vary.
Worked Example
Classify each scenario as short-run or long-run: (a) A restaurant hires two more waiters for the weekend rush. (b) Amazon builds a new fulfillment center. (c) A farmer buys additional land to expand operations.
Check yourself · no marks
A tech startup can double its server capacity in 2 hours by renting cloud computing. Is this short run or long run for cloud infrastructure?
Commit to one first. Guessing and being wrong beats reading the answer cold.
Practice · 1 / 4
In the short run, which statement is true?
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