Any transaction can be seen as a contract between the two parties. The so-called transaction cost can be seen as the cost of the transaction contract. According to Mr Coase and others, a type of transaction costs arise from the accidental factors that occur when a deal is signed. These incidental factors may not be written into the contract due to the fact that they could not be foreseen in advance, or although they could be foreseen, they could not be written into the contract due to too many factors. Another type of transaction costs is the signing of contracts and the cost of monitoring and enforcing contracts. During the depression, the rate of interest reduction, the expansion of money supply, stimulate economic development. During the expansion period, the interest rate increases, the money supply is reduced, and the economic development is suppressed. So, interest rates have a big impact on our lives. With their understanding of how muscles work as well as the need for the neurological system in conjunction with movement, they combined weight training, stretching, balancing, and agility work. The only way to try this is in their book ProBodX (Copyright 2003) and their respective websites. They take four factors that highly involve the central nervous system. These factors are: Mr Draghi said the positive news about eurozone growth meant that the bank's council was "increasingly confident" that inflation would strengthen over the long term and become "self-sustaining". But he added that the current policy needed to be maintained to "maintain inflation", reaching the ECB's target of close to 2 percentage points.