At which stage the production is completed?

(A) when product is manufactured
(B) when product is used by the consumer
(C) when product reach the consumer
(D) when product reach the retailer

The answer is: (C) when product reach the consumer

How are commercial services and direct services interrelated?

(A) Commercial services depend on direct services
(B) Buying and selling are examples of direct services
(C) Direct services include advertising, accounting and medical services
(D) Tertiary production consists of commerce and direct services

The answer is: (D) Tertiary production consists of commerce and direct services