Final answer:
The thrust of most business legislation in the United States can be summed up as allowing any practice that does not b. substantially reduce competition and harm consumers or society.
Step-by-step explanation:
In the United States, the thrust of most business legislation can be summed up as: any practice is permitted that does not substantially reduce competition and harm consumers or society (option b).
This means that as long as a business practice does not harm consumers or society, and does not significantly reduce competition in the market, it is generally allowed under the law.
However, it is important to note that laws and regulations may change over time, so it is essential for businesses to stay informed and comply with the latest legal requirements.