Affirm (NASDAQ:AFRM) stock enjoyed a strong late-day push after Goldman Sachs initiated coverage on the buy-now pay-later company with a “buy” rating. Indeed, Goldman Sachs analysts were clearly impressed by Affirm’s business model, setting a price target of $42 on AFRM stock. That implies roughly 25% upside from the stock’s closing price of $33.70 per share.Why is Goldman Sachs so big on Affirm?Well, according to the firm, Affirm’s strength lies in its portfolio and underwriting. Indeed, analysts pointed o ...