When are business letters necessary? check all that apply. a. persuasive, well-considered presentation is important. b. recipients are located in another country. c. formality and sensitivity are essential. d. communication is with the government. e. a permanent record is required.

watch how they communicate and watch how they handle their free time

hope it !

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy

answer; sales of books;