Revenue Defined as Sales Income

Steps:

• Recall that revenue in economics is the total income from selling goods or services.
• Evaluate option A: It matches the standard definition of money from sales.
• Check option B: Sales volume measures quantity, not monetary value.
• Check option C: Surplus over costs describes profit, not revenue.
• Check option D: Tax payments are outflows, unrelated to revenue.

Why A is correct:

• Revenue is defined as the total money received from sales of goods and services, per basic economic principles.

Why the others are wrong:

• B: Sales volume is the number of units sold, not the monetary amount.
• C: Surplus over costs is profit, which is revenue minus expenses.
• D: Tax payments are obligations to government, not income from operations.

Final answer: A