buying and selling for profit on ebay In the light of monetary crisis 2007 - 2010, many companies have had to trim their spending. Meanwhile, in the earlier years, they donated immeasureable dollars. Although there remained many big corporations which still gave away billions to charity within the global slowdown, others slimmed down their funds donations. In 2009, many company gained bigger profits, but this would not translate into bigger donations. Tough economic times can't prevent America's largest business from continuing giving in 2009. 30% of the large corporations gave more cash, and 16% gave a comparable because the year before. In general, total of 68 companies gave less during 2009 than 2008. Cash and product giving combined fell the first time for recent seven years. The following is a summary of companies which gave most during 2009. They were measured by comparing total giving in cash and products during 2009 to total profits in the year before. The level of productivity of society determines the organizational form of social basic economic units. Enterprise is the result of the development of social productive forces to a certain level, which is the product of commodity production and exchange of goods. Modern economy, the interest rate as the price of money, not only restricted by many factors in the economic and social, and changes in interest rates to have a great impact on the economy as a whole, as a result, modern economists are studying the interest rate decision problem, pay special attention to the relationship between the variables and the balance of the economy as a whole, the interest rate decision theory has experienced the classical interest rate theory, Keynes's interest theory, interest rate in loanable funds theory and is-lm analysis as well as the contemporary evolution of dynamic interest rate model, the development process. But in order to better future, we must expand the definition of the word "profit", the economic benefits and social benefits are included, and understand that block chain itself is a social innovation of technical solutions. So there is concern that the yield will not fall below the historic low of 2.4%. Solution: as long as the gasoline in the tank is exhausted, the extra gasoline vapor in the tank can be fired into the cylinder by the negative pressure of the engine, and no gasoline vapor will overflow.