Why do consolidated financial statements become increasingly important when the purchase differential is very large

Why do consolidated financial statements become increasingly important when the purchase differential is very large
When a parent company has equity ownership in a company, financial and tax regulations- dictate how to report such equity- a related company, for example ownership of 80% or more of another corp, requires the parent to file a consolidated tax return with its subsidiary. As the percentage drops, various rules dictate how to report equity in an affiliate.

Not thorough enough