According to Jerome McCarthy, "basic marketing" : a market is a group of potential customers with the same needs; They are willing to trade the goods or services offered by the seller in exchange for something of value, which is the way to meet the demand. The fund's managing director Christine Lagarde said Christine Lagarde, in June 2016, voted to leave the European Union has an impact, the British economic growth this year and in other parts of the world economic growth. The API said gasoline stocks rose by 200.10 million barrels last week, an increase of 2231, 000 barrels. Refining inventories fell by 2.58 million barrels last week, or 13.27 million barrels. The response to multifactor values is rigid. Rigid instinct (also called the unconditioned reflex) refers to several different tropism in a certain direction organically to form a complete reflex arc reaction mode, it is congenital formation of lower animals, to determine the external stimulation produced by the reaction of the relatively fixed form. Rigid instincts are organisms after a long period of natural selection, gradually formed the low passively adapt to the environment of a kind of way of life, it is born, determined by the genetic factors, to appear without the need for training the day after tomorrow. For example, mechanical stimulation of the coelenterates and arthropods; The newborn's grip reflex, sucking reflex and adult knee jerk reflex, scratching reflex, etc. Instinct is the development form of tropism, rigidity of compound stimuli from a specific things comprehensive response, it makes the organism and the external environment to produce a higher level of coherence, formation of more advanced orderly structure. Anyway, rigid instinct is lower biological things outside of the value of multiple factors is the primary way of ordering reaction, is on the tropism, extension, and the synthesis, make tropism has more purposeful, tropism is get distillation. There are many things you plus your children are capable of doing over a rainy day. For instance you might watch T.V. Or you might take action that might be more educational for you and your children. You along with your children are capable of doing a science project. You are probably wondering the reason why you may want to perform a science project. Here are 5 reasons science projects are wonderful activities for rainy days. If classical economists have interpreted the "market" as "laissez-faire", coase has answered the question of how to achieve "laissez-faire" or "price mechanism".