Barring major declines through the market close, the indexes should end the week up, which investors will welcome with open arms. October will be a memorable month for stocks, which were racked by swings of volatility after an extended bull run the last 10 years.

This is a stark contrast to the oil markets, which has seen prices fall 20% in the last month.

“You have a trifecta of supply, demand and sentiment,” said Frank Verrastro, senior vice president at the Center for Strategic and International Studies. “Supply is up. Demand is down. And sentiment is more complicated about how severe the Iranian sanctions will be.”

Related: Oil ETFs Retreat Ahead of OPEC Meeting

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