In​ business, property,​ plant, and equipment wears out as it is used to ▼ create expenses generate revenue increase liabilities ​, leaving less and less of the​ asset's benefits for the future. Throughout the​ asset's life, accountants gradually transfer part of the ▼ cost estimated value market value to an expense account called ▼ Accumulated Amortization Amortization Expense Asset Expense . The cumulative sum of all amortization expense for an asset appears in an account called ▼ Amortization