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Re:Robinhood Raises Another $2.4B from shareholders by dpiers on Monday February 01, 2021 @12:53PM (#25991162)
Call it a scantily-clad short then. A share that is already lent out to a short seller should not be eligible to be lent out again for the same reason I can't get two mortgages to buy the same house - the underlying collateral would be owed to multiple parties.
Re:Robinhood Raises Another $2.4B from shareholders by 314 on Monday February 01, 2021 @01:05PM (#25991331)
This is not true. Party A has a contract that party B owes them a share - not the share that they originally loaned. The whole idea is for party B to buy a share later to balance the trade.

A better analogy to understand why short interest can rise above 100% is fractional reserve lending and the effect that it has on money supply.

Re:Robinhood Raises Another $2.4B from shareholders by rokobobo on Monday February 01, 2021 @01:06PM (#25991355)
A share is a share is a share. You can’t tell which one was loaned out and which one wasn’t. And it’s not used as collateral, money is posted as collateral instead.
Re:Robinhood Raises Another $2.4B from shareholders by ZephyrBlu on Monday February 01, 2021 @12:57PM (#25991233)
This is ok because all instances of borrowing the share don't need to be settled simultaneously.