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When you buy stocks, bonds, options and commodities futures, it's typical to buy in a particular volume or a particular dollar value, called a round lot or a unit of trading.
For example, stocks are usually traded in lots of 100 shares, or multiples of 100 shares, and bonds in multiples of $1,000. For some preferred stocks, known as ten-share traders, the unit of trading is ten shares.
Any variation from the standard unit of trading is known as an odd lot.
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