For all those wondering why re-hypothecation occurs.... here is a suggestion in an example: It is an example only I am not saying its right or wrong

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lets say you have $100 in a broker account and purchase $40 worth of stock. Traditionally you would own the stock and maybe get interest on your remaining $60 at 50 bps below cash rates.
Nowdays to buy that $40 worth of stock the broker actually makes you lend the money with a small margin. so you actually put up $10 and borrow $30.
For the borrow you pay a clip/spread/cost.
So you have the same exposure to the stock $40, but you also have a loan of $30 at which you are paying 50bp above cash, and receiving interest on your total balance $90 (ie; $100 - $10 margin)
So your total book is actually $90 cash $10 to margin, $30 loan......
So ask your self....stick it in a simple spreadsheet and see.
Lets assume interest rates at 5% on money you have at the broker, and the charge for borrowing is 5.5%.....a 50 bp clip....more than fair...
Assuming the stock price does not change....iel; it is still at $40
So in the old days....you received $60*5%=$3 interest at the end of the year.
whereas with Rehypo...
You have received $90 * 5%=$4.50 interest for the year.....BUT you have paid $30*5.5%=$1.65.....
Net amount you receive $3 on one way, and 4.5-1.65=$2.85 the other way.....
where do you think that money goes? That is a reason for why it may be done. (I am not saying it is)
(While many complain about the contract they did not read or understand and yet still signed, many also just trust and dont understand or account for the costs of doing business either.
This does not negate that I do believe we need more transparency and less legalese without extra regulations.....which wont stop fraud and misuse of funds anyway.)
just food for thought.