A booming Wall Street business is about to be tested for the first time (LC, ONDK)

The marketplace-lending business has boomed in the post-financial-crisis era, with loan volumes swelling and the leading companies going public. The growth of the market — which matches borrowers with investors, who purchase the loan ― has in part been predicated on an extended period of low interest rates. Soon, though, market conditions will change. The Federal Reserve is being tipped to up interest rates in December. That will create a key test for an industry that has ballooned in an era...