KDP vs Barnes and Noble Press: Same Ebook Pay From $2.99 to $12.99, Double Outside It
KDP vs Barnes and Noble Press: same ebook pay from $2.99 to $12.99, but B&N pays 2x on 99c and $14.99 box sets. KDP wins paperbacks by $0.99.
How Long Should a Romance Novel Be? A 50,000-Word Book Can Pay 82% More per Word Than a 91,000-Word One
How long should a romance novel be? 50k–100k words: Harlequin’s median is 55k, Amazon’s top 100 average 91k. Why shorter pays 82% more per word.
Stock Bond Correlation Over Time: 33 Years of SPY vs Treasuries, and Why It’s +0.42 Now (Python)
Stock bond correlation over time, 1993-2026: SPY vs Treasuries was -0.29 in 2000-2021, +0.42 now. Inflation link, 60/40 impact + Python.
KDP AI Translation Is Free, but Translating Only Book 1 Leaves 64% of the Money on the Table
KDP AI translation (Kindle Translate) is free in beta. A human translation needs 3,683 sales to break even; why translating only Book 1 loses 64%.
IngramSpark vs KDP: The Same $14.99 Paperback Pays $4.39 on KDP and $0.75 at IngramSpark’s 55% Discount
IngramSpark vs KDP in 2026: a $14.99 paperback pays $4.39 on KDP vs $3.00 or $0.75 via IngramSpark. Per-copy math, hardcovers, and the hybrid setup.
Is BookBub Featured Deal Worth It? Book 1 Alone Needs 66% of Clicks to Buy, a 5-Book Series Needs 4.7%
Is a BookBub Featured Deal worth it? At $0.99 a standalone needs 66% of clicks to buy; a 5-book series needs 4.7%. All 44 categories, with real fees.
Sequence of Returns Risk Example: Same 25 SPY Years, Reversed, and $1M Ends at $119,235 vs $3.77M (Python)
Sequence of returns risk example: same 25 SPY years, $1M, 4% rule. Real order ends at $119,235, reversed at $3.77M. Charts, fix + Python.
Best AI for Writing Fantasy Novels: A 120k-Word Epic Earns 2.4× a Novella per KU Read
Best AI for writing fantasy novels: a full KU read of a 120k-word fantasy pays $3.39, 2.4x a novella. Pick a tool that keeps 120k words consistent.
Is Expanded Distribution on KDP Worth It? One Amazon Sale Equals ~3 Expanded Copies at $14.99
Is Expanded Distribution on KDP worth it? At $14.99 keep $2.12 vs $5.11 on Amazon (~3 ED copies); at $9.99 ED pays $0.12.
How Much Does It Cost to Self Publish a Book on KDP? $0 to Upload, $1,920–$8,930 to Do It Pro
How much does it cost to self publish a book on KDP? $0 to Amazon, $1,920–$8,930 for editing and covers, and 557–2,589 sales to break even.
Kindle Unlimited All Star Bonus: Stuck at $3.4 Million Since 2024 While the Fund Grew 19%
Kindle Unlimited All Star bonus, explained: $3.4M a month since 2024, just 4.9% of KU pay. Who gets it, when it pays, and what it’s worth in page reads.
Missing the Best Days in the Market: Skip SPY’s 10 Best Days Since 1993 and $313,613 Becomes $136,082 (Python)
Missing the best days in the market, tested: skip SPY’s 10 best days since 1993 and $10k ends at $136,082, not $313,613 (−57%). Charts + Python.