Since you mention you did not study economics, I will make a small note on terminology. "Earn" in economics means profit. What you mean, the way it might be sa

Since you mention you did not study economics, I will make a small note on terminology. "Earn" in economics means profit. What you mean, the way it might be said by economists, is you receive $1000 in revenue. That is, funds you get from customers paying for your product. To go a bit further, you would "earn" that amount less the costs of providing the product, including amortized costs for its development.