In 1 or 2 sentences, describe how legal contracts provide incentives for people to exchange goods and services

Explanation:

Legal contracts provide legal certainty in business, that is, through contracts it is possible to have reliability between the parties. Thus, contracts are an important part of a capitalist economy, as the legal certainty they provide encourages greater trade in goods and services.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

answer; an active listener;