I am trying to understand the relative value of one page type in Google + versus another.

This brand search (https://www.google.com/search?client=safari&rls=en&q=Barbara+Oliver+%26+Co+Jwwelery&ie=UTF-8&oe=UTF-8#q=Barbara+Oliver+%26+Co+Jewelry&rls=en&spell=1) was done using a European based proxy server and incognito mode on Chrome.

The Local Knowledge panel shows. If that is the case then IF a business has a G+ Page for local why would they also need a Brand or Company page for national or international marketing?

What would its tactical or strategic value of a brand or company page be in exposure, search results or marketing sense?

Why couldn't they just use one page even if a vast percentage of their sales were national?

I am, of course not talking about the Coke's or the Fords of the world. I am talking about a local businesses that also do some ecommerce. 
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