Why do we study microeconomics?

Microeconomics analyses economic decisions made at an individual, or micro, level as opposed to macroeconomics which approaches economics from a macro level (an economy as a whole).
Austrian economists don’t believe that there is a ‘macroeconomics’. Everything can eventually be broken down to be viewed into a microeconomic perspective. According to many economists today, macroeconomics is still somewhat irrelevant, unless you can justify your arguments and facts with microeconomic theory.
For example, Hayek may argue that unemployment is a microeconomic phenomenon that is created by incorrect relative prices, not a macroeconomic problem caused by a general deficiency of aggregate demand.