How Often to Rebalance Portfolio? Once a Year (39 Trades Matched 477 in 40 Years)
How often to rebalance portfolio? Once a year: in a 40-year 60/40 Python backtest, 39 trades matched monthly’s 477 on Sharpe with a smaller drawdown.
KDP Select vs Wide: 60 Wide Readers Replace 100 Kindle+ Readers (Long Books Should Stay)
KDP Select vs wide: 60 wide readers replace 100 Kindle+ readers for a 300-page $3.99 book, but long books win in Select. Python calculator inside.
Are KDP Ads Worth It? A Standalone Breaks Even at $0.27 a Click, a 5-Book Series at $0.83
Are KDP ads worth it? A $3.99 standalone breaks even at $0.27 a click, a 5-book series at $0.83, vs $0.70-0.90 fiction CPCs. Python calculator inside.
KDP Launch Strategy: Book 1 Is Only 32% of the Money
KDP launch strategy for series authors: Book 1 is only 32% of a reader’s value. Pre-order rules, bank-or-publish math and a Python script for KU income.
How Much Can You Make on Kindle Unlimited? $1.43 per 300-Page Read, 699 Reads for $1,000
How much can you make on Kindle Unlimited? About $1.43 per full 300-page read in 2026, so $1,000/month needs ~699 reads. Series math + Python script.
Lump Sum vs DCA S&P 500: A 3-Month DCA Lost Money More Often Than Investing at Once
Lump sum vs DCA S&P 500 since 1988: lump sum won 65-78% of 453 start months, and DCA barely changed the odds of a losing year. Python script included.
KDP AI Book Cover Math: 25 Designer Covers Cost $20,000, a Hybrid $4,000
KDP AI book cover rules and math: disclose AI images, use 1600×2560. 25 designer romance covers cost $20,000; a hybrid $4,000. Python payback calculator.
Multiple Pen Names on KDP: 3 Names Turn a 25-Month Path to 25 Books Into 75 Months
Multiple pen names on KDP? KDP allows them, but at 1 book a month 3 names need 75 months to reach 25 books each. When splitting pays, with Python math.
Compare My Portfolio to the S&P 500: Why a 3.7-Point Loss Can Look Like a Win (Python)
How to compare my portfolio to the S&P 500 the right way: a Python shadow benchmark on 5 years of real data turns a fake +1.5-point win into a 3.7-point loss.
Best AI for Writing a Book Series: Book 5 Needs 213,000 Tokens of Memory
The best AI for writing a book series needs memory: by Book 5, Books 1-4 are 213,000 tokens. Why a story bible beats a bigger window, with Python math.
How Often Can You Publish on KDP? 3 a Day Max, but Monthly Hits 25 Books in 25 Months
How often can you publish on KDP? Up to 3 new titles a day, but 25+ books matters more: one a month gets you there in 25 months. Python math inside.
How to Price KDP Ebook Series: $3.99 Wins Alone, a $0.99 Book 1 Earns 2.1× on 5 Books
How to price KDP ebook series: $3.99 earns most for a standalone, a $0.99 Book 1 earns 2.1x across 5 books, and paid ads favor $3.99. Python model inside.