Answer:
A.
Explanation:
Duncan James Watts is a sociologist that was born on February 20, 1971 in Guelph, Canada and became principal researcher at Microsoft Research. To investigate how some pop songs become hits, Watts manipulated songs' ratings and download numbers to observe the effects on songs' popularity. By doing so he analyzed if the manipulated ratings caused the songs popularity to go up or down.
From what I understand, you mean when the dollar's value increases on the open market. This means that it takes more of a currency to get to 1 USD. Take Thai Baht for example (THB). Typically, it takes approx. 30 THB to get to 1 USD. So when the value of the USD rises, it can take up to 36 THB to get to 1 USD. Make sense?
<span>d. lowering the costs of production of a good.</span>
I believe that the answer is experimentation.
