Activity-based costing (ABC) is an efficient management technique for assigning and governing the overhead costs. Overhead expense analysis and assignment can be produced more accurate through the use of ABC processes for a wide range of products, for product expenses and profitability analysis as well as for appropriate distribution and control over the overheads. The rubber hose in the engine compartment will be used for a long time and it will be a problem for older vehicles. Once aging, gasoline can leak into the engine compartment. The air conditioning system will allow the smell of petrol to enter the car. Therefore, once the rubber tube is old, need to change promptly! According to the carrying capacity, there are minivans (under 1.8 tons), light trucks (1.8-6 tons), medium goods vehicles (6-14 tons) and heavy trucks (over 14 tons). For many, the first benefit of entering the blockchain and cryptocurrency world could be economic gain. It is also worth noting that in 1985, the financial accounting standards board released the concept of income from the concept framework (SFAC)NO. 6. In 1989, the international accounting standards board's framework for preparing and providing financial statements made clear that benefits also included unrealized gains. In 1997, FASB's FASB N0.130 required a full return; In 1998, IASC's IAS NO.1 required the preparation of an equity change table, a comprehensive income statement, including the benefit of reflecting corporate assets. In his theory, money supply is controlled by the central bank and is an exogenous variable with no interest rate elasticity. At this point, monetary demand depends on people's psychological "liquidity preference".