By Morten Ravn and Vincent Sterk
http://d.repec.org/n?u=RePEc:red:sed017:1067&r=dge
New Keynesian models with unemployment and incomplete markets are rapidly becoming a new workhorse model in macroeconomics. Such models typically require heavy computational methods which may obscure intuition and overlook equilibria. We present a tractable version which can be characterized analytically. Our results highlight that – due the interaction between incomplete markets, sticky prices and endogenous unemployment risk – productivity shocks may have radically different effects than in traditional NK models, that the Taylor principle may fail, and that pessimistic beliefs may be self-fulfilling and move the economy into temporary episodes of low demand and high unemployment, as well as into a long-lasting “unemployment trap”. At the Zero Lower Bound, the presence of endogenous unemployment risk can create inflation and overturn paradoxical properties of the model. We further study financial asset prices and show that non-negligible risk premia emerge.
There is so much going on in this paper I cannot summarize it. Just read it.
NEP-DGE Blog 
Unless proper assestment is accounted for of all production factors-especially energy surplus and other land resourse-then growth models will be incomplete as will all its macro-micro and financial Dimensions. When that surplus was so abundant and cheap it was safe to take it for granted-not any more. See my book The Energy Within Economics (Nova Science Publishers, NY, 2012)