Microeconomics and Macroeconomics (amv)

Smart distinction by Don Boudreaux:

Microeconomics focuses on the actions of individuals; it examines how individuals respond to incentives, as well as studies the various incentives that individuals in different circumstances confront. Gary Becker is a living example of a premier microeconomist.

Macroeconomics involves tracing out the unintended consequences of various actions and sets of individual actions. It studies the logic of the spontaneous, unintended order (or disorder, as the case may be) that emerges when each of many individuals respond to the incentives identified and classified by microeconomics. On this definition, Hayek is certainly one of history's greatest macroeconomists.