Answer:
1. the overall operation of the national and global economy.
2. The B she received on the exam.
3. the slope of the graph is negative.
4. the slope of the graph is positive.
5. graphically illustrates the concept of scarcity.
6. increasing opportunity cost.
Explanation:
1. Macroeconomics is best defined as the study of the overall operation of the national and global economy.
Macroeconomics can be defined as the study of behaviors, performance and factors that affect the entire economy. Hence, it focuses on aggregate phenomena such as price level, economic growth, Gross Domestic Product (GDP), inflation, unemployment and national income levels with respect to the central bank, demand or supply shocks, government policies, aggregate spending and savings.
2. The opportunity cost of going to the beach is the "B" grade she received on the exam.
In Economics, opportunity cost also known as the alternative forgone, can be defined as the value, profit or benefits given up by an individual or organization in order to choose or acquire something deemed significant at the time.
Thus, the value of the opportunities lost (scoring an "A" grade) by going to the beach is the opportunity cost of her choice.
3. When two variables have an inverse relationship, then the slope of the graph is negative.
An inverse relationship can be defined as a relationship between two variables, in which an increase in the value of one variable leads to a decrease in the value of the other variable i.e as the value of one variable becomes large, the value of the other variable becomes small.
4. When two variables have a direct relationship, then the slope of the graph is positive.
A positive relationship or correlation can be defined as the relationship between two variables in which there exist a direct relationship between them i.e as one variable increases, the other increases and vice-versa.
5. The production possibilities curve graphically illustrates the concept of scarcity.
The production possibilities curve (PPC) is also known as the production possibilities frontier (PPF) and its a curve which illustrates the maximum (best) combinations of two products that can be produce in an economy if they both depend on these factors;
1. Technology is fixed.
2. Resources are fixed.
6. A production possibilities curve that is concave or bowed out from the origin represents increasing opportunity cost.
The production possibilities curve (PPC) is depicted graphically as an arc, by representing one good on the y-axis and the other on the x-axis.
