Overcapitalization runs rampant in the business writing.
Proper nouns are those items which refer to a specific name - a person, a place, a company or department in a company, software packages. This gets confusing because some words can be used both as a specific name and in a general sense. So you can properly refer to the Accounting Department or discuss an accounting practice.
The key is that it is a name, not just that it is specific. This gets confusing because sometimes it is a matter of intent that makes the difference as to whether something is being used as a name.
If I talk about the kiosk and there is only one kiosk referred to, yes, I am talking about a specific, but almost no one would think that it was the name of the kiosk. But if I talk about the government, the intent can make a difference. In ordinary writing or discussion, I would normally not capitalize if I refer to the government. But in legal or contractural language, the Government is the specific name I am using to refer to someone who is a party to the contract.
In the original post, Business is capitalized. In this case either Business should be lower case or, if you genuinely are thinking of the Business Sector as the name of a specific entity, both words should be capitalized.
If you are going to create an acronym, the first letters of all the words describing it should be capitalized when you spell them out before your first use of the acronym. (This is something you should do in business writing.)
Questions about posting. See faq183-874