Buy Ketchup in May and Fly at Noon: A Guide to the Best Time to Buy This, Do That and Go There

Buy Ketchup in May and Fly at Noon: A Guide to the Best Time to Buy This, Do That and Go There

by Mark Di Vincenzo

4.0 (74)

4.0 stars from 74 reviews


$1.99KU78% off peak

Last checked: May 14, 2026

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Fans of these authors will like this...

  • Malcolm Gladwell
  • Tim Harford

Fans of these books will like this...

  • Freakonomics
  • The Undercover Economist

Perfect for you if...

  • You're pragmatic about money and keen to stretch your budget further without sacrificing quality or experience.
  • You like collecting useful life hacks and tips you can actually apply to your week, not abstract self-help advice.
  • You appreciate concrete, searchable answers to questions you've genuinely wondered about but never bothered to research.

Maybe not for you if...

  • You prefer deep dives into single topics rather than a broad collection of quick-hit tips across different areas of life.
  • You're sceptical of advice that promises optimisation for everything, or you find prescriptive guidance limiting rather than helpful.
  • You're looking for emotional resonance or storytelling. This is a reference book, not a narrative.

About this book

Buy Ketchup in May and Fly at Noon is a guide to the optimal times for accomplishing a wide range of tasks and activities. The book covers timing advice for both significant matters—such as financial decisions and marriage—and everyday activities like napping and walking your dog. The book addresses practical questions about daily life, including the best day of the week to buy groceries or dine out, the best time of day to ask for a date or a raise, and the best time of day to undergo surgery. It also provides guidance on when to purchase items like iPods, when to visit popular attractions like the Louvre with minimal crowds, and when to make offers on houses. By identifying the right times to perform various activities, readers can save money, use their time more efficiently, improve their health decisions, and make better career choices.

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Price History

Kindle price over time. Green zones = periods when the book was free.

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Free$4.50$8.99Apr '20Aug '24Aug '25Feb '26
$0.50$8.99

Currently on sale at $1.99 — 78% off peak. Price has dropped 17 times over the last 6 years. Goes on sale roughly every 40 days. Typically stays discounted for 56 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

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#863#1,258,187#2,515,511May '18Sep '23Jul '25May '26

Currently around #422K in the Kindle store — a niche title. Climbing the charts — 56% improvement recently.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

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3.5★4.3★5.0★Dec '23Mar '24Aug '24Mar '26Apr '26RatingReviews

Currently 4.0★ from 74 reviews

Review activity has been quiet recently. Rating has remained stable at 4.0 over the tracking period.

Sale Prediction

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Free$4.50$8.99Apr '20Aug '24Aug '25Feb '26PredictedMay '26

Actual Predicted

This book is currently discounted at $1.99. It typically returns to around $8.99.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

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Mark Di Vincenzo

1 book on Vagrant Press

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