Source
Lenny's Podcast: Product | Career | Growth — The most successful AI company you’ve never heard of | Qasar Younis (March 8, 2026) ·
at 58:02 ▸ ·
at 1:00:37 ▸
When this applies
when deciding how to allocate limited lifetime reading/learning budget across a flood of available content
The takeaway
When your consumption budget is small relative to the available content, prioritize content that has already survived a long selection/filtering process over unfiltered recent content.
Why it works
Time has already filtered low-quality content out of the pool of old books, so the average quality of a randomly chosen old, well-regarded book is far higher than a randomly chosen new book; given a lifetime reading budget of only ~50-100 books, maximizing average quality per book matters enormously.
One level up
Scarcity of attention justifies seeking pre-filtered signal sources over raw, unfiltered streams.
Where it stops holding
This stops working when the domain is changing so fast that old material is simply obsolete (e.g., current AI techniques), where Younis himself admits reading new material like the 'Vibe Coding' book 'goes against my grain.'
Detail
rule: Read old books, not new ones, because time has filtered out the noise; specifically seek out the best book in a domain you know nothing about.
threshold: Lifetime reading capacity estimated at ~50-100 books for the average person — too small to waste on low-quality/unfiltered content
rationale: Understanding of society and history, even indirectly connected to your industry, improves your capacity for judgment/taste as a leader, by Younis's own (unproven but strongly held) belief.
In their words
And in your life, you're going to, a thousand books, maybe you'll read. Like in the best case scenario, you're going to read probably 50 to 100 books, which is kind of crazy for the average person. So you're just not going read many. So don't read low quality content.