Taking out a prosper loan to buy stocks

[QuadNine9]

Why don't you buy the stock on margin? If you can do this, you can take only half the loan amount and play less absolute dollars in interest for that loan. Then you use that money to buy the underlying stock on 50% margin. You would probably pay less interest on the margined part of your stock purchase than you would if you took out the entire amount and used it to buy the position without margin.