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Now Playing: 08-27-12 Marketplace

Tropical storm Isaac is expected to bring extreme rain and winds up to 95 miles an hour. Kai Ryssdal talks to Sal Sunseri from Louisiana about how his oyster company is faring. Meanwhile, car rental company Hertz says it will buy its rival Dollar Thrifty for $2 billion, and keep all three companies intact. A small town in South Dakota is home to a large population of foreign workers. A teacher describes the 'pink slip anxiety' that's become common at the end of school years. And our Food for 9 Billion series continues with a look at food waste in Senegal and in suburban California.