Investor Due Diligence Report
by Danielle DiMartino Booth
QI Research brings both Wall Street and Federal Reserve experience together with a vast network of connections across the finance industry. We triangulate institutional sentiment, what central banks watch, and how monetary policy affects investing.
34K
1K paid
~0%
Subscriber count is a platform estimate
Pricing
$59/mo
$595/yr annual option
$46K
1K paid subs
$32K/mo – $60K/mo(±30%)
5.6
0.02%
(comments + likes) / subscribers
~4x per week
4.3 posts/week
82/100
Very Consistent (~1.7d avg)
| Newsletter | Subscribers | Weekly Growth | Price | Platform |
|---|---|---|---|---|
| Kyla’s Newsletter | 156K | +0.7% | $10/mo | substack |
| Geld für die Welt | 41K | N/A | $5/mo | substack |
| Alex Krainer's Substack | 34K | N/A | $5/mo | substack |
| Rational Optimist Society | 26K | N/A | Free | substack |
| Month | Subscribers | Est. Revenue | Change |
|---|---|---|---|
| Feb 2026 | 34.1K | $53,010 | — |
| Mar 2026 | 34.1K | $53,010 | ~0% |
| Apr 2026 | 34K | $52,785 | ~0% |
Platform Dependency
Hosted on substack subdomain
Publishing Consistency
Regular publishing schedule
Key Person
Single-author publication — key-person dependency
Revenue Model
Active paid subscription tier
Subscriber threshold
34K subscribers — above the 5K category median for first paid tier
Has paid tier
Active paid subscription offering
Peer monetization
100% of 16 similar-size peers in Economics have paid tiers
Pricing position
$59/mo vs $8/mo category median (191 newsletters)
| Date | Monthly | Annual |
|---|---|---|
| Jan 2026 | $59 | $595 |
Disclaimer: This report is generated automatically based on publicly available data and proprietary estimation models. Estimated subscriber counts are derived from engagement patterns and should be verified through direct disclosure. Revenue estimates are based on known pricing and estimated paid subscriber counts. This report is for informational purposes only and should not be the sole basis for investment decisions.
Score based on available components only.
| Component | Score | Weight |
|---|---|---|
| Engagement Rate | 3/100 | 30% |
| Paid Subscriber Ratio | 50/100 | 25% |
| Publishing Consistency | 30/100 | 10% |
| John Rubino's Substack |
| 23K |
| N/A |
| $5/mo |
| substack |