Capital losses refer to losses from the sale of fixed assets and are generally non-recurring. They do not arise from normal business activities and can only be set off against capital gains. Revenue losses arise from normal business operations and recurring expenses exceeding income. Revenue losses indicate business inefficiency while capital losses do not. Capital expenditures provide benefits over many years while revenue expenditures only provide short-term benefits within a year. Capital receipts are non-recurring from sources like owner's capital or asset sales, while revenue receipts are recurring from regular business operations.