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The book topics reveal why I've seen such a jump in sales--the relevant, timely topics pertaining to the economic uncertainty facing the United States and the world.
This sudden jump in Amazon earnings shows that relevant affiliate links in timely content can increase your revenue as a writer and provide your readers with further resources on the topic they are researching--a true win-win situation. While I am sure the economic downturn and financial woes will have a negative impact on over all retail sales, certain niches will still see growth. Market those as you continue to offer your readers quality, relevant content.