The major driver of economics is the equilibrium approach, which has taken various forms over the years. General equilibrium is the statement that all the different parts of the economy influence each other, even if it's remote, like mortgage-backed securities and their demands on automobiles.

Any purchase is one for the future. If you buy a refrigerator, you are making a commitment to the future so that you have food to eat for the next ten years.

Not every business cycle has a financial crisis. Frequently they do.

Kenneth Arrow Quotes