Shares of Dow Chemical fell 15-percent Monday afternoon after a multi-billon dollar joint venture between the company and a state-owned Kuwaiti company fell through. The collapse is raising questions about the Midland based chemical company's continued willingness to pay billion of dollars to buyout Pennsylvania based Rohm & Haas company - a deal already in the works. Dow's previous deal with Kuwait's Supreme Petroleum Council would have earned the company more than $17 billion. Dow Chemical planned to used that money to buy Rohm & Haas for more than $15 billion. Now it is unclear whether or not Dow officials intend to keep the agreement.