Where to start your collection
Collect what you read. The most coherent and satisfying collections are built around genuine intellectual engagement with the authors and subjects collected. A collector who reads widely in American literature of the 1920s and 1930s knows what they are looking for in a way that a collector who buys on price trend alone does not. Start with one author or one subject and learn it properly before expanding
Entry-level collecting for twentieth-century first editions begins at a few hundred dollars for authors of genuine literary significance whose first editions have not yet attracted broad collector interest. The books worth collecting at that level are identifiable through the bibliographies and through conversations with specialist dealers who know the market.
CollectorGrade take
Collect what you read. The knowledge that comes from genuine engagement with the literature is a more reliable guide to quality than any market analysis. Books worth collecting are almost always books worth reading.