People resort to rules of thumb to make complex decisions, especially:

A) if they have a good understanding of the factors involved.
B) when they have little experience with the issue at hand.
C) when the market system does not function freely.
D) when issues of fairness are involved.

Rules of Thumb

General principles that provide practical instructions or guidelines, typically based on experience rather than theory.

Complex Decisions

Decisions that involve multiple factors, variables, or outcomes, often requiring significant judgement and analysis to resolve.

Market System

Refers to the network of buyers, sellers, and other actors that come together to trade in a given product or service.