When the firm increases the amount of output in short run, it experiences an increase in marginal cost of production as except one all factors are variable so accordingly cost of production rises.
According to the concept of the short run, some inputs will be constant while others will be variable within a defined period of time in the future. It conveys the belief that an industry responds to sensory stimulation differently based on the amount of period it has to accomplish so. The term "short run" somehow doesn't refer to a precise time period rather to the business, sector, or economic component under investigation.
Since except one all factors remain variable in short run therefore the marginal cost of production will rise with each unit produced.
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