Even Lot: Even Lot is a unit of trading in a commodity established by an exchange to which official price quotations apply. See Round Lot.
Job Lot: Job Lot is a form of contract having a smaller unit of trading than is featured in a regular contract.
Round Lot: Round Lot is a quantity of a commodity equal in size to the corresponding futures contract for the commodity.
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Naked options trading is very risky - many people lose money trading them. It is recommended contacting your broker or investment professional to find out about trading risk and margin requirements before getting involved into trading uncovered options.