On large scale
The branch of economics which studies individual unit of an economy such as individual consumer, individual producer, individual firm,etc.
It is the branch of economics that deals with the study of economics at an individual, group or company level.

Microeconomics is that branch of economics which studies economic problem at the level of the individual, an individual firm, an individual household or an individual consumer
Microeconomics is the economics which study the economics as a single unit
Microeconomic studies in economic relationship or economic problem at the level of individual …and microeconomic assumed that macroeconomic is variable remains constant…
Micro economics studies the behavior of individual units of the economy.