Final answer:
Corporations are the type of business entity that generates 90% of the business revenues in the United States, despite the fact that there are a greater number of small businesses and sole proprietorships in existence.
Step-by-step explanation:
The forms of business entities that exist in the United States are sole proprietorships, partnerships, and corporations. When considering which of these forms generates 90% of business revenues in the United States, it is important to recognize the impact of corporations. Corporations are very large businesses and include corporate giants such as Wal-Mart, Microsoft, or General Motors. They can become public by selling shares and are often responsible for a significant portion of business revenues due to their scale and reach.
Despite the prevalence of small-scale businesses and the sheer number of sole proprietorships and partnerships, it is the corporations, especially the 17,000 large firms employing more than 500 workers each, that generate the lion's share of business revenues. These large corporations contribute to the economy by providing additional jobs, introducing new technology, generating change, and producing substantial tax revenues.