The document discusses the accounting equation which states that for any business, assets must equal the sum of liabilities and owner's equity. Assets are economic resources owned by the business. Liabilities are amounts owed by the business. Owner's equity represents the owner's claim on the assets of the business. The accounting equation - assets = liabilities + owner's equity - must always balance as transactions occur. Several examples of how the equation is affected by common business transactions like purchases, sales, and payments are provided.