gross profit margin calculation he market demand for the mobile, server and SSD product rapid growth, make the memory and flash memory maker Micron and achieved good quarterly results, that is a signal to markets want to continual change. He said he believes "this is really a long-term trend in pushing for continued use of memory and storage." Economist lynde hull explained that the benefits of capital in different periods of time would be interest. According to linde hull, interest in a specific period and the difference between the expected consumption is savings (during the period of the growth of capital), and returns the sum of consumption and savings are given period of time. Recently, virgin brought an app, from closing, that caused problems. When I first booked two invoices with it, the fare was 20 pounds, not 17 pounds. I asked virgin about it on social media. Managing Director Martin Nettleton says: “Last month, we saw a record number of interactions from our website as a result of our advertising and PR, with enquiries coming directly from the contact form online, via email and via calls into our customer service department. According to this model, the interest rate decision depends on the supply of savings and investment needs, money supply, money demand, four factors, cause a change in the saving investment, money supply and demand factors will affect the level of interest rates. This theory is characterized by general equilibrium analysis. This approach periodically revised future plans based on the implementation of the plan and changes in the environment, and moved forward over the period to integrate short-term and medium-term plans organically. As it is difficult to accurately predict the future of the plan work affect organizational survival and the development of economy, politics, culture, technology, industry, customers and other factors change, and as the extension of planning period, the uncertainty is greater and greater. Therefore, the implementation of a planned implementation of a mechanical, or mechanical, and static execution of a strategic plan by a number of years ago may result in significant errors and losses. Rolling planning can avoid the consequences of this uncertainty. The specific approach is to make plans in a very short and thin way.