UWTI / DWTI - there's a risk that Credit Suisse may no longer be able to make an orderly market in these ETFs since they're not issuing new shares. That was the mechanism by which they put downward pressure on prices when they exceeded fair value based on the futures market. So in theory the shares could become overvalued, but not undervalued. Whenever there's a slight undervaluation, Credit Suisse will simply buy back shares. Maybe they'll still sell those "treasury shares" to maintain the fair price.
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