Final answer:
Economists consider a savings account and a share of IBM stock to be capital.
Step-by-step explanation:
Economists consider (C) a savings account and (D) a share of IBM stock to be capital. Capital is a factor of production that is used to produce other goods and services. Examples of capital include physical objects like office buildings, machinery, and tools, as well as financial assets like savings accounts and stocks that can be used to acquire capital.