, the key determinant of whether the diversification creates value would be: whether the diversification enhances the competitive advantage of either or both of the two businesses
Here is an example of business combination in different sectors that create a value.
Let's say that a mobile manufacturer called company x (from electronic sector) combines its-self with an animation company (from entertainment sector).
Company x could obtain value from this combination by rewarding free movie/tv shows subscription for every mobile phone that they sold. By doing this, the sales in both sectors will be increased