Economic growth is not merely desirable but morally imperative, argues Tyler Cowen in this philosophical treatise on long-term thinking and human flourishing. Drawing on utilitarian ethics and a deep concern for future generations, Cowen makes the case that sustainable growth compounds over time to produce incalculable benefits for the billions of people yet to be born. The central question animating the book is how we should weigh the interests of people who do not yet exist against those living today. Cowen, an economist at George Mason University known for his eclectic intellectual interests, argues that our obligations to the future are far greater than we typically acknowledge. A one percent difference in growth rates, sustained over centuries, produces civilizations of radically different wealth and capability. This leads Cowen to what he calls Crusonia plants, a thought experiment about assets that grow without tending, to illustrate how wealth creation serves humanity across time. The book engages with questions about rights, environmental protection, and the limits of cost-benefit analysis. Cowen defends human rights as side constraints on growth while arguing that most policy debates focus too narrowly on near-term effects. He critiques both left and right for discounting the future too heavily. Readers interested in effective altruism, existential risk, or the philosophical foundations of economics will find this slim volume packed with ideas that challenge conventional thinking about progress and responsibility.