In "Rational Decisions," Ken Binmore embarks on a profound exploration of the intricacies of decision-making in the complex tapestry of real-world scenarios, challenging the supremacy of Bayesian decision theory as the be-all and end-all for rational choice. With a narrative that is both accessible and minimal in its use of mathematics, Binmore delves into the foundational principles of choice and belief under the shadow of risk and uncertainty. Through a lucid exposition, he revisits the constraints that Leonard Savage, the pioneer of Bayesian decision theory, himself acknowledged—questioning the practicality of applying such theories in the vast, unpredictable realms of scientific innovation and economic ventures. Binmore's critique unfolds a compelling argument that while Bayesian theory offers a robust framework for decision-making within controlled, "small world" environments, it falters in addressing the complexities of "large world" situations where outcomes cannot be neatly anticipated. Proposing an innovative extension to the conventional Bayesian approach, Binmore introduces the concept of "muddled" strategies—an expansion of mixed strategies in game theory—offering a more nuanced methodology for navigating decisions when the stakes extend beyond the calculable. "Rational Decisions" stands as a seminal text, inviting scholars, strategists, and the intellectually curious to reconsider the boundaries of rationality and the essence of making choices in an unpredictable world.