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COLUMBIA - Gas prices continue to fall at pumps across Mid-Missouri Monday. At some locations in Columbia a gallon of regular unleaded costs $3.33. The national average stands at $3.59 a gallon.

If you follow this link you can see last month's trend. The graphic shows Missouri's average gas prices last month in blue compared to the national average in red.

So why are the prices falling?

As school starts, fewer people are traveling on vacation creating less demand and lowering the price. The recession could be another important factor because as companies cut travel expenses and lay off workers people drive less. The arrest of Moammar Gadhafi's son could potentially drop gas prices further if Libya becomes more stable.