Mrinos. Be carefull! Go to the website and read what is said there. This was posted some time ago:
"Indeed, one of the more high-profile ETF embarrassments of late is the MacroShares Oil Up (UCR: 39.72, +0.03, +0.07%) and MacroShares Oil Down (DCR: 0.28, -0.01, -3.44%) funds. While most rival ETFs rely on futures contracts to track the up-and-down movements in crude prices, the MacroShares' funds were more complex, mimicking oil prices by shifting assets between the two portfolios. However, because oil more than doubled in price since the funds launched, Oil Up effectively ended up with all of the assets on its books, leaving Oil Down high and dry. The unanticipated development is forcing the funds to be dissolved on June 25."
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