Which of the following best describes how railroads the united states economy grow?
a.
they made trade easier by businesses reach distant markets.

b.
they ended the shipping industry.

c.
explosives were used to blast through rock.

d.
they charged very high rates.

Locate an article online from a news source that illustrates at least one determinant of supply. write a summary of the article, list the determinant(s) that were discussed in the article, and give a brief explaination of the effect of the determinant(s). you don't need to write the entire thing out, just find a source and tell me what i should include. i'm not the best at some parts of economics, and this is one of the parts i suck at.