Canning's view In the early 20th century, famous American economist elvin fisher developed the theory of economic gain. In its book "the nature of capital and yield", first, the concept of yield is analyzed in terms of the performance of earnings, and three different types of benefits are proposed: Gas vehicles mainly include liquefied petroleum gas vehicles (LPG vehicles or LPGV) and compressed natural gas vehicles (CNG cars or CNGV). As the name suggests, LPG cars are fueled by liquefied petroleum gas (LPG) and CNG is powered by compressed natural gas. The CO emission of gas vehicles is more than 90 percent less than the gasoline car, the hydrocarbon emission reduction is more than 70 percent, and the nitrogen and oxygen emission reduction is more than 35 percent, which is the current relatively practical low emission vehicle. As hicks income concept did not specify what is called "equal wealth", and thus the income concept formed the basis of many debates concept, and the theory of accounting earnings, especially the capital preservation theory has a great influence. In accounting, people used to call "maintaining the same level of affluence" as capital preservation. 3. The cost of accounting earnings is listed in historical cost. Due to the current accounting practice in the enterprise asset is measured at the historical cost in, with the cost nature is the historical cost has been derived from the law of the transfer, so as to determine the income is an important factor in the cost and the historical cost. The Child Support Agency (?CSA') is able to order what many of us remember as ?Garnishee Orders' against employers to be able to siphon-off a share of your employee's income with regards to collecting child maintenance. Such orders, in this area of law, really are a creature of statute and therefore are called ?Detachment of Earnings Orders' (?DEO'). Rather confusingly, DEO's are not the same as the Third Party Debt Orders within Part 72 of the Civil Procedure Rules. Nomenclature aside, a real difference that is certainly to be present in the DEO is the manner in which one refers to have them set aside. An appeal against a DEO's lies on the magistrates' court on circumscribed bases, the definition of which includes led to costly, confusing, litigation.