In the 14th century, plague ravaged Europe and Asia and was called the Black Death. Plague does not respond to penicillin, but other antibiotics are effective. Sanitary measures against fleas and rodents, quarantine and extreme caution in handling infectious materials help to suppress epidemics.
1. Expense recognition. Expenses are decreases in assets (e.g., rent expenses) or increases in liabilities (e.g., accrued utility expenses) that result from operating activities undertaken to generate revenue. Expenses are recognized in accordance with the matching principle. This principle mandates that the expense or cost of doing business is recorded in the same period as the revenue that has been generated as the result of incurring that expense or cost.
For example, if you book a legal expense, you decrease equity by booking a debit for to Legal Fees. The other side of the entry must either decrease an asset account, or increase a liability account. If you are accruing the expense (cash to be paid at a later date) you would cr. Accrued Legal Fees. If the dr (-) and cr (+) were not the same for equities and liabilities, double entry accounting would not work.