What role does business-level strategy play in relation to business growth market capitalization?

What role does business-level strategy play in relation to business growth market capitalization? What roles do a firm’s core competencies play in a decision to diversify into new businesses? Why does unrelated diversification have a worse performance record than related diversification? The final paragraph (three or four sentences) of your initial post should summarize the one or two key points that you are making in your initial response.