What is defined as the total revenue from selling goods multiplied by the quantity of goods sold?

The correct choice is total revenue. This term refers to the complete income generated from selling goods or services, which is calculated by multiplying the price at which goods are sold by the quantity of those goods sold. For instance, if a company sells 100 units of a product at a price of $10 each, the total revenue would be $1,000 (100 units x $10).

Understanding total revenue is crucial in economics because it helps businesses assess their sales performance and make informed decisions about pricing, production levels, and market strategy. It's also a foundational concept that connects to profitability, as total revenue must be compared to total costs to determine financial success.