Melinda A. Roberts introduces the newcomer to population ethics and investigates the key issues in a way that will be of interest to professional philosophers, economists, lawyers, and students in all those areas who seek to understand what a cogent, intuitively plausible theory of population will look like. To that end, Roberts presents five perplexing but telling existence puzzles that already are or shall soon become important parts of the population
ethics literature: the Asymmetry Puzzle, the Pareto Puzzle, the Addition Puzzle, the Anonymity Puzzle, and the Better Chance Puzzle. Roberts develops solutions to the puzzles that together form a partial theory of population, a collection of principles grounded in intuition but highly sensitive to the formal
demands of consistency and cogency.