PMCM of sure!
When someone wants to sell short, these stocks are borrowed by the broker, but if the broker has not physically these shares, the broker can create the fictitious while you cover the operation again. Now, with the new system from 3/15/2014, the broker may not do this until they physically have the actual shares that are to be performed.
Usually this method is widely used, and often abused as operators to block a stock at the ask, so she does not have the freedom to ascend, by the pressure of the bid.
This method may not be used from the date of the letter.
We will return to the true, pure and free market. Bid / Ask
News 
Market Data 
Discover 
