Final answer:
The rational decision-making process assumes that perfect information is available, enabling individuals to make informed choices that maximize their self-interest.
Step-by-step explanation:
One of the fundamental assumptions of the rational decision-making process is that perfect information is available. This assumption implies that individuals have access to all relevant facts and data required to make an informed choice, allowing them to weigh the costs and benefits effectively and arrive at a decision that maximizes their self-interest. While actual human behavior often deviates from this model due to emotions, inconsistent preferences, or use of simple heuristics, the rational decision-making process serves as an ideal in economic and business models.