What would a Keynesian likely recommend in response to a recession? What would a neoclassical likely recommend? Why would a Keynesian policy response not make much sense in response to a minor recession like the one that occurred in 1990? What would be the cost of letting the economy adjust by itself to a new long run equilibrium?

Why would a Keynesian policy make more sense in response to a major recession like the one that occurred in 1982? What would be the cost of following a neoclassical policy then?