Final answer:
The third function that organizations must perform to create goods and services, in addition to Marketing and Production, is Operations. This involves turning economic inputs into outputs, such as in the case of making pizza.
Step-by-step explanation:
The answer to the student's question: Marketing, Production, and __________ are the three functions that all organizations must perform to create goods and services, is Operations. The production function is the process whereby a firm turns economic inputs, such as labor, machinery, and raw materials, into outputs like goods and services that consumers use. In the example of pizza making, the pizzaiolo (pizza maker) uses various inputs - flour, water, yeast, tomatoes, spices, and cheese, along with labor and machinery (like the oven) - to create the output, which is the pizza sold to consumers.