Offer your thoughts or opinion on the input financial query or topic using your financial background.

Is there any kind of unsecured stock loan?
In the U.S. it is typical that a stock brokerage account can be set up to buy stock with up to half the cost being borrowed from the broker.  This is called a margin account.  The stock purchased must remain in the account until sold (or the loan is paid off), as it serves as built-in collateral for the loan.  If the market price for the stock goes down too much, you will be required to add money, or the stock will be sold to cover the loan. See this question for some more information.