Dr Jonas Salk developwd the vaccine to prevent polio.
<span>The correct answer to this question is that the best description of the Bill of Rights of the answers listed here is most likely B - it outlines them. Prior to the bill of rights, there was no set definition of what citizens did and did not have a right to.</span>
The standard of living is improved through something called "comparative advantages", which means that, relative to the nations' total output and ability to make other things, each nation produces something that they're better at making than the other. When the nations trade, they are able to use these comparative advantages to create a more efficient, productive economy.
Even if one nation is wealthier or better off than the other, this principle means that both countries can still become better off through trade.
Can you attach a picture of the excerpt
