definition of short position:
from, investopedia:
This is the number of shares currently borrowed by short sellers for sale, but not yet returned to the owner (lender). Every short seller anticipates a declining stock market. A profit is made if the stock is bought back at a lower price than when it was sold short. When a large amount of short selling activity is occurring, market participants obviously expect prices to head lower. Short sellers are potential buyers sooner or later and represent a lot of buying power when they have to scramble for cover in a sudden market turn.
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