Investment is defined as the commitment of current financial resources in order to achieve higher gains in the future. It deals with what is called uncertainty domains. From this definition, the importance of time and future arises as they are two important elements in investment. Hence, the information that may help shape up a vision about the levels of certainty in the status of investment in the future is significant. From an economic perspective, investment and saving are different; saving is known as the total earnings that are not spent on consumption, whether invested to achieve higher returns or not.
Consumption is defined as one’s total expenditure on goods and services that are used to satisfy his needs during a particular period. The values of investment or saving, as well as consumption, can be determined at the macroeconomic level, or at the individual level, through different statistical methods.