Fill in the blanks to complete the passage about one of the three key functions of money. because money creates a it is possible to compare the prices of two goods, which allows people to communicate the goods in a way that is easily understood. this characteristic of money also enables it to serve as , or a way to measure accounts and transactions in a consistent manner.

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a researcher conducts a comparison of the comments made in a publicly available blog and the blogger's comments on a similar topic in a weekly magazine. undergraduate students in a field methods class are assigned a research question and asked to interview another classmate, to be followed by a class discussion on interview techniques. a cognitive psychologist enrolls undergraduate students for a computer-based study about the effect of mood on problem-solving behaviors. a researcher sets up a meeting with the superintendent of a large and diverse public school system to get data about the ethnic composition of the school system and the number of students receiving free lunches.