i watched both the videos, I am not convinced on your economy of scale point.
Already these business run on 45% margins , issmein kya mil jayega cost advantage economy of scale se ?
bhai mein thoda kam margin 30% mein apni dukan khool lunga. Jo ki sab kar rhe h … As barrier to entry is low and return on capital is high.
Low margin businesses mein economy of scale works, Jaha already industry 1-2% margin pe kaam kar rhi ho aur waha competitor k pass gunjayish nahi apne margin kam karne ki. (like grocery businesses).
These are good businesses but not available at good price.
All the best 