What is the macroeconomic model presently policy makers of major economies are trusting on?

Every microeconomics sells their ideas concerning demand and supply equilibrium, market elasticity, production theory, and more other aspects. Almost all of them interrelate in a way, but there is always an outgoing one.

In regards to the 2007/2008 recession, the New Keynesian theory played a significant role in claiming back stable economies. The model emphasizes on more government expenditure, taxation, and provision of job opportunities. Keynesian believes that government intervention is of the essence in regulating and monitoring economic activities. The idea of spending focuses more on creating demand for goods and services. In the process, there are emerging job opportunities.

For example, the US operates under a mix of market economy and command economy (mixed economy). It gives way for free market operations, with less government intervention same as the new Keynesian microeconomics approach. Successfully, the American governments depended more on expenditure and raised taxation (for the wealthier) in the last revolution. The results came out positive, where almost all economic variables gained stability in the economy.