buy minus order means: If you are interested in general equities or rare market stocks, you can order to purchase a specified amount of stock. However, the price must not be higher than that of the previous sale, if it is a zero or minus tick. The minimum fractional change of the stock should not exceed the value of the last sales minus the minimal fractional change. The limit is the maximum buy that can be made, regardless of tick. (in Stock Market Dictionary)
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