Product prototype

The searches confirm the URLs are live and contain relevant information. The HBR article via USC (marshall.usc.edu) is a direct PDF, which aligns with "readable by the public (no paywalls, no broken links, no placeholders), no gated PDFs" as it's not gated behind a login.

Here's the plan for the article's structure and content, incorporating the LINK_POOL and external links:

LINK_POOL (Internal)

1. Product development
2. Market research
3. Investment
4. Capital expenditure
5. Risk management
6. Innovation
7. Startup
8. Return on investment
9. Customer feedback
10. User experience
11. Feasibility study
12. Scalability
13. Business plan
14. Funding
15. Go-to-market strategy

External Links (Verified)

1. History: eScholarship.org
2. Practical Applications: marshall.usc.edu (Harvard Business Review via USC)
3. Limitations: arkaro.com
4. General Importance: upb.ro

Now, I will generate the article.