common stocks uncommon profits 3. The role of securities investment 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. 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. This is exactly where the role of team building events Melbourne companies deserves a special mention. They offer great packages at reasonable prices. In addition to that, to ensure the team building events activity find its logical end, they feature necessary equipment and trained personnel also. They offer many choices including that relating to solving a mystery, movie making, to ensure impressive and functional teams can be built.