The features of economic cycle lies in such aspects as high-platform shake in the growth of high-platform industry,convergent fluctuation and shortage imbalance.

Economic Analysis on the Shortage of Low-price Essential Medicines Caused by Price-lowering Policy;

Preliminary Discussion on the Shortage of Licensed Pharmacists in the USA;

The analysis and consideration to the high-skilled personnel shortage in the power field;

As a result of a weak consciousness of water-saving among people, serious waste of water, low efficiency of water use in industrial and agricultural productions, environmental pollution, and over-exploitation of groundwater, scarcity of water resource in China is serious.

<Abstrcat> Standard textbooks tell us that, in market economy, ceiling price would result in scarcity, but they don t give answers to such questions as how to distribute scarce resources among consumers.

The primary scarcity risk factors of water resources in the irrigation region of the lower Yellow River are obtained by using the principal component weight analysis method and the grey association analysis method,the water resources carrying capacity of each region is evaluated with multifactorial comprehensive evaluation of risk factors.