The milk as a factor of production is known as a variable factor of production and the increase in the price of milk changes Starbucks’s short run cost curve as the AVC, ATC and MC curves upward.
These are those production factors that do change with output, that is. more are employed when production increases and less are usued when production decreases.
Some examples of a variable factors include labour, energy, and raw materials directly used in production.
However, the milk is also an example of a variable factor for Starbuck because the price of the raw material for producing its coffee keeps inculcating with economic trends.
Hence, the milk as a factor of production is known as a variable factor of production and the increase in the price of milk changes Starbucks’s short run cost curve as the AVC, ATC and MC curves upward.
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