NEW YORK ( Stockpickr) -- Fears of a global economic slowdown have sent investors running for cover. They've been selling stocks with any cyclical exposure, especially the companies that sell commodities.Yet it's important to understand the trading trends for these commodity stocks. They typically move in and out of favor quickly, and now that they are deeply out of favor, they offer real value for longer-term investors. >>4 Loser Stocks Poised for Big Rebounds Indeed, if the worst-case scenarios out of Europe do not come to pass, these stocks could post significant gains. With that in mind, here are five deeply-discounted commodity stocks that have traditionally rebounded sharply when the commodity cycle turns back up.