As someone who does teach economic history, the story is never told
simply in terms of AD-AS. That does play part of the story but other
points of view are taught -- the various monetary theories (Friedman and
Hayek have very different explanations); the various Keynesian views;
but also the various structuralist views and Schumpeter's ideas on
cycles. Giving only one view would give student's a incorrect picture of
the economics profession. As this list demonstrates endlessly,
economists rarely agree.
Rod Hay