Technology or capital will not always move in a straight line in one direction, it must be curved. When it rises or falls to a certain extent (such as reaching the pressure level, supporting point or the main force is willing to change), it will move in the opposite direction corresponding to the original direction, which is called retracement.

Capital refers to the capital for the operation of industry and commerce, and also refers to the materials or currency used by the state to develop the national economy. Capital is expressed as currency, which is used for turnover and meets the needs of creating social material wealth. It embodies the socialist relations of production based on public ownership of information. Capital is the media value used to create new value and increase the value of social surplus products in the process of social reproduction. It also refers to capital management, which means that only a small part of capital is at risk in any transaction.