They go on buying sprees, shortages develop and prices rise.

If the crackdown is succeeding, shortages may develop only after cocaine already in the supply line has been sold, officials said.

Meanwhile, the airlines are hiring record numbers of pilots and a shortage is developing.

But they caution that shortages could develop if farmers plant substantially more than 75 million acres.

If the economy grows more quickly, then shortages develop and prices are driven up.

In addition, a chronic shortage of silver coins developed.

Consumers are buying everything in sight, but no shortages have developed to drive up prices.

That system was supposed to rely on market price, but produced astronomical fees as a shortage developed.

In Westchester, real estate agents say, demand is so strong that a shortage of warehouse space has developed.

The higher rates were intended to discourage this activity so that shortages would not develop, and with them rising prices.