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31 may
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(English call - demand) -1) - an option to purchase, the right to purchase goods, securities, futures contracts at a stipulated price at any time before the expiration of the option; 2) a short period during exchange sessions, during which the conclusion of transactions is limited to one position (one month of delivery), that is, each position is quoted in turn in order to introduce a higher organization; 3) margin requirement.

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