As markets have gone from bad to worse, wary investors have flooded into recession-safe stalwarts, ranging from gold to Procter & Gamble. Here's one that hasn't been picked through yet: trash.rnWaste haulers have a history of coming out of recessions smelling sweet. During the last one, which ended in early 2003, the S&P 500 lost 35% of its value. The stocks of garbage haulers held up. REPUBLIC SERVICES (20, RSG) was up 18% and WASTE CONNECTIONS (31, WCN) 4% during the downturn. Even the laggard of the business, WASTE MANAGEMENT (28, WMI), did better than the market, losing 22% of its value.
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