1.   These supply constraints are not the usual physical barriers to increased output imposed by the productive potential of the economy.

2.   Analysts attributed the results to falling prices for chips, delays in new products and supply constraints caused by the earthquake in Taiwan last month.

3.   But supply constraints that have hampered Apple in recent quarters continued, dragging down earnings.

4.   For years, supply constraints meant that there was little premium-quality California wine to export.

5.   In the latest quarter, analysts said, Intel was faced with supply constraints and effectively shifted production to higher-performance chips from those that Gateway wanted.

6.   The rapid growth of urban centres poses daunting challenges such as bottlenecks, supply constraints, as well as health and environmental concerns.

7.   The state of California has made a wonderful example of supply constraints in electric utilities.

8.   But Apple executives have taken an upbeat attitude, expressing confidence that the problems can be solved and that the worst of the supply constraints are over.

9.   Oil stocks also rose as supply constraints continued to push the price of crude oil higher.