 mechanism of choice and under this mechanism of choice I am going to explain for you the third mechanism that is mostly utilized in today's world that is the mixed economy. Now the question comes why we are going to explain or select the mixed economy. As we have studied before that there can be one version of the market structure and there can be one version of the garment intervention. But the garment interventions they are if excessively utilized so they may have a capacity that they can not only increase the productivity but sometimes increase in the productivity deals in that matter that it has a number of factors that reduce the productivity means the cost of production that can be more and the cost of management can be more than the total output. If we say in simple words that many times the facility which started for the job but the problem in managing it has come so far that the actual situation of the facility has been over reduced. So due to such a problem in many government interventions if we say it is called government failure and in the same way in the market structures if the accumulation of wealth becomes a power and some factors or sectors take more power as we say can be monopoly and in the form of monopoly people can hold some resources or in this form if they are using excessive utilization then they can affect the environment, affect the sustainability so the externalities aspects are. So to overcome these issues now the best method is to take both the positive aspects together so that can be the mixed economy or the mixed method. Now what is done is that certain forces of the market structure they are allowed to work as a self-correcting mayor independently they will be allowed to work but under certain rules certain under regulation accumulation of wealth control government strong taxation policies under the licensing system. Every person will not have the permission to enter but some pre-requisites will be made for him who will be able to complete those pre-requisites or those basic rights in the market and after that they will have to pay for their business, their business and their income. And you will also have to tell that how much the environment, society, social structures are affecting. Now if we say here then I will give you a very simple example that if a person has the permission to apply a tube or a well then it is his right to apply it but if he does not do such excessive drilling of water which is his responsibility of his heart then the level of the water of his land should go down. So while looking at these rights the social forms and social structures for the government will make some rules which will follow the agents working in the market forces. And if we look at the basic in this then the role of the government will be here that the government wants to maintain equality in the wealth distribution or we should say in other words that the assets that we have after completing the request of the people in the market or the income comes in their hands, the assets come, its distribution, its distribution is kept in a uniform way so that only a few people in the whole economy become aware of that. And on the other hand the government's duty will be to make policies for economic growth, to grow the economy, to develop the economy and to set up its objectives for it. So these mixed structures are taking a lot of our countries with them and this is feasible for us.