Loading may be the work which is invested in a work centre. For example, time might be lost while changing over from making one component to another. If your machine breaks down, it won't be available. If there is machine reliability data available, this should also be considered. Sometimes the equipment might be awaiting parts to arrive or be 'idling' for many other reason. Other losses could have an allowance for the machine being run below its optimum speed plus an allowance to the 'quality losses' or defects which your machine may produce. Of course, several losses should be small or non-existent in the well-managed operation. Finite loading is an approach which only allocates work to a work up to set limit. This limit is the estimate of capacity for that work centre (in line with the times designed for loading). Infinite loading can be an way of loading work which doesn't limit accepting work, but instead tries to handle it. Surplus value is created by employing workers in the process of direct production, but it must be transferred to the currency before it can be realized. Whether or not the goods can be sold and sold at what price, profits can be achieved and how much they can be achieved will depend on the specific conditions of supply and demand and market competition. In particular, capital goods of retrieval from the industry capital movement become the commercial capital, specific implementation of commodity value and surplus value function, and accordingly obtain business profits, make the relationship more complicated and more likely to cause mystification. In the process of circulation, some factors restricting the production process, or with, or to the conflict between capital and labor, into between capital and capital, pure relationship between buyers and sellers, and so on, all this will cover the production process with the difference between the circulation process, it is easier to put the cost price as the intrinsic value of the real goods, consider profit higher than the result of the sale of commodity value, the surplus value and commodity value contained in the implementation, in the process of circulation has been reversed expression is created from the sale. Because, the original business profits are exploited by industrial capital in the process of production to the part of the surplus value of transformation of form, but is considered in the process of circulation through the buy low sell high, produce, or paid by consumers upon. And class relations are distorted, business profits are reflect the commercial capitalist through industrial capitalists to hire laborers, the relationship between exploitation and exploitation were buried, and distortion of between capitalist and capitalist and capitalist with pure commodity trading relationship between the consumers. The level of productivity of society determines the organizational form of social basic economic units. Enterprise is the result of the development of social productive forces to a certain level, which is the product of commodity production and exchange of goods. Commercial vehicles: vehicles used for transporting personnel and goods in design and technical features, and can be tractor-trailer. Passenger cars are not included. Commercial vehicles are divided into three categories: passenger cars, vans and semi-trailer tractors. The passenger bus subdivided into small passenger car, city bus, coach, tourist bus, articulated bus, coach, cross-country coach and private bus. Goods vehicles are subdivided into general goods vehicles, multi-purpose lorries, full trailer tractors, off-road trucks, special operations vehicles and special goods vehicles.