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training_data/relevant/text/c078051e4b9d77d1dd5a14343a6acff5f3b84443d74e52e8a7dc574c6501587e.txt

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+Open Interest and Volume
+Traders use many types of market data to make trading decisions. Two
+items that are often studied but sometimes misunderstood are volume and
+open interest. Volume, as the name implies, is the total number of contracts
+traded during a time period. Often, volume is stated on a one-day basis, but
+could be stated per week, month, year, or otherwise. Once a new period
+(day) begins, volume begins again at zero. Open interest is the number of
+contracts that have been created and remain outstanding. Open interest is a
+running total.
+When an option is first listed, there are no open contracts. If Trader A
+opens a long position in a newly listed option by buying a one-lot, or one
+contract, from Trader B, who by selling is also opening a position, a
+contract is created. One contract traded, so the volume is one. Since both
+parties opened a position and one contract was created, the open interest in
+this particular option is one contract as well. If, later that day, Trader B
+closes his short position by buying one contract from Trader C, who had no
+position to start with, the volume is now two contracts for that day, but open
+interest is still one. Only one contract exists; it was traded twice. If the next
+day, Trader C buys her contract back from Trader A, that day’s volume is
+one and the open interest is now zero.