There is such a unique market opportunity created by the stark imbalance between supply and demand that social entrepreneurs have enormous incentive to invest in clean water.

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Risk spreads could expand in 2011 as more new issues come to market and the imbalance between already strong demand and increasing supply narrows.

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When prices for commodities rise, it is usually because of either a change in the cost of bringing the product to market (increasing fuels could do that), the cost of capital, or an imbalance between supply and demand.

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The rising price of fuel is largely a result of an imbalance between supply and demand.

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The Fed would use the discount rate rather than the federal funds market to supply or withdraw credit in response to any imbalance between supply and demand for it.

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