**1. Introduction**

When people are asked why health is important, many are unable to answer it. The reason for this may be due to their lack of awareness of the importance of health and the consequent lack of proper self-care. Health can generally be considered an essential basis of life, but many people still do things that show that health is not a priority in their lives. They spend a lot of time on the opportunities they find but do not spend time learning what is good for them to exercise or stay healthy; they spend their budget on Nonsignificant things. But for a more nutritious diet, they pay less.

According to the World Health Organization's definition, health is a state of complete physical, mental and social well-being and not only the absence of disease or infirmity. This definition of health has been given more attention since 1978 at the UN Summit in Almaty. Due to the considerable differences in the level of health in different countries of the world, the members of this organization were required to provide Primary Health Care by providing an essential package aimed at reducing the health gap between different countries and with the goal of Health for All by the year 2000. Undoubtedly, one of the most critical concerns and challenges that different countries have faced in providing primary health care to their population has been the lack of resources in the face of the growing need to receive this care during all these years.

So from the perspective of health economists, health is a durable good, or type of capital, that provides services. The flow of services produced from the stock of health capital is consumed continuously over an individual's lifetime. Each person is assumed to be endowed with a given stock of health at the birth time, such as a year. Over the period, the stock of health depreciates with age and maybe promoted by investments in Health services. Death occurs when an individual's stock of health falls below a critical minimum level.
