More than just the coverage of the Malthusian trap,
This review is from: Malthus: A Very Short Introduction (Very Short Introductions) (Paperback)
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The very short introduction are a fun series of short books written by knowledgeable academics.
I had only know Malthus from reading "The Worldly Philosophers" a fantastic book on the history of economics. Malthus was touched on by describing the Malthusian trap, a model of population growth (and a very pessimistic view at that).
What's interesting about this book is that it goes beyond covering Malthus's work on population growth. The book describes interesting aspects of Malthus's life (how his faith influences his writings) as well as more general political economic theories.
For anyone interested in history and economics, this is a very readable addition to your bookshelf.