How to differ expense from liability?

Question

From the definations, expense will casue the economic interest out of the corporation, as similar to the quality of liability which will also cause the economic interest out in the future.

What's the difference between the two?

Answer 1

An expense is already incurred and is included as a debit (Pre-paid insurance). There was a benefit to the company from the expense.

A liability occurs without being planned, as if you sold your stocks for a loss. Expenses have to be matched with income, liabilities are subtracted directly.