Airing on Friday, July 24, 2015: Amazon reported earnings yesterday, and its stock price soared. Today it has a market value very similar to that of Wal-Mart. Yet Amazon’s quarterly profit was only a fraction of Wal-Mart's. How can that be? Marketplace explores. Plus, lots of people on the parched West Coast are hoping that predictions of a strong El Niño this winter will prove correct, because a season of hard rain is needed. Others remember El Niño as just that — a season of hard rain — and are concerned about a winter of floods and mudslides.