what is a good retail profit margin The response to single factor value is trend. The tendency is the selection bias produced by the stimulation of the organism on a single environmental factor, which is the directional response form of the organism to the external stimulus, including the two basic forms of orientation and avoidance. The tropism has the tendency of phototropism, thermal tendency, wetness, tendency, and oxygenicity. It has the avoidance of light, heat, moisture, anaerobic and so on. For example, the acidity of paramecium, the thermal tendency of bedbugs and the phototropism of insects. The trend is the common response of low biological cells, biological tissues and protozoa. Tropism is in a series of internal inductance organically combined in a certain direction, to form a structure of ordering, and external single environment factor to form a single reaction, the biological function between the body and the external environment on the coherent function, to accelerate the ordering of the body development. When this series of inductivity is combined in a positive way, the tendency is formed. When this series of induction is combined in reverse, it forms a negative trend - the avoidance. In summary, the trend is the most elementary preordinate response to the external things of single factor value. In New York, the U.S. energy information administration (EIA) released data showing U.S. crude inventories fell by 649.5 million barrels a day in the week ended Dec. 15, beating expectations. Gasoline stocks rose by 12.37 million barrels, but the increase was less than expected. There is no risk of this arbitrage. Range and once the two currencies yield, the yield of arbitrage mechanism will make two currencies are equal, that is, different interest rates in the currency of the country there is inherently a trend towards an equalization and trend, it is the interest rate index key aspects of the impact of foreign exchange to, also is our interpretation and grasp the key interest rate index. Despite the exploitation of labor force, selling unqualified products is an illegal method to make profits. /Regardless of falling short for standard, some firms have falsified products with rude and coarse ingredient. What's more, they immorally and intentionally manufacture products by damaging human body. /For instance, Sanlu, Chinese dairy company, is notorious for the excessive amount of detrimental ingredients in milk instead of nutritional ones. Numerous cases of severe damage to babies have boiled the whole country into anger. The Sanlu transformed from high-profit to breakdown overnight. The success depending on the fraud on products will collapse sooner or later.