Larry uses an accrual method of accounting and a calendar year. On December 30, 2019, he completed work for a client and submitted his bill. The client had no dispute with the work done or the amount of the bill. The client paid Larry's bill in 2020. In which year should he report the income from this project?

The goal of an economist who formulates new theories is to a. provide an interesting framework of analysis, whether or not the framework turns out to be of much use in understanding how the world works. b. provoke stimulating debate in scientific journals. c. contribute to an understanding of how the world works. d. demonstrate that economists, like other scientists, can formulate testable theories.