The conglomerate structure is kept by choice in the case of Berkshire Hathaway. There's a pretty good outline of the reasoning by Buffett in the 50th anniversary letter.
3M is often used as an example in Strategic Management, particularly as an example of Mintzberg's views (strategies emerge and are not planned). I think the emerged strategy is usually labeled "working with surface material" or something.
I guess one could argue "battery company" is an emergent strategy for Tesla in that sense but I think there's certainly planning to it and it wasn't just discovered. But you can use that "post-branding" that is typical of Mintzberg and I think the author of the blog does a good job.
3M is often used as an example in Strategic Management, particularly as an example of Mintzberg's views (strategies emerge and are not planned). I think the emerged strategy is usually labeled "working with surface material" or something.
I guess one could argue "battery company" is an emergent strategy for Tesla in that sense but I think there's certainly planning to it and it wasn't just discovered. But you can use that "post-branding" that is typical of Mintzberg and I think the author of the blog does a good job.