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Why there has to be two lines in a plane

In the supply-and-demand schedule shown above, at the lowest price of $50, producers supply music players and consumers demand music players.

The purpose of safety stock is to: a. eliminate the possibility of a stockout. b. control the likelihood of a stockout due to variable demand and/or lead time. c. eliminate the likelihood of a stockout due to erroneous inventory tally. d. protect the firm from a sudden decrease in demand. e. replace failed units with good ones.