There is always a struggle whether macroeconomic really exist or it is an aggregative only, except for Money Supply. You can have all your ISLM model but it as

There is always a struggle whether macroeconomic really exist or it is an aggregative only, except for Money Supply. You can have all your ISLM model but it assumed equilibrium for it to work. But real work never have that (and hence you have money which does not need in a global perfect equilibrium model).