Error argument

 There are ongoing debate about failure of demand manage policy. However, lot of their arguments seem not base on economics, many economists had finded out their errors.  So, I want to introduce what's supply-side  economics and demand-side economics. I will also find out different between supply-side economics and aggregate supply as well as demand-side economics and aggregate demand.
What's supply-side economics ?
In economics, supply-side economics is a school of macroeconomics though that argue economic growth. In the long run, our income level is reflect our ability to produce goods and services. We can not archieve higher income and living without output expansion.
Beside that, demand-side economics is also a school of economics, it's main assertion negate the most important force of free market to drive in an economy. They argue the demand is created by household, business and government, therefore they support government to intervene in an economy.  So, when crisis happen, they use Keynesion as proof to must have a intervention policy to market.