An affine asset pricing model in which agents have rational but heterogeneous expectations about future asset prices is developed. We estimate the model using data on bond yields and individual survey responses from the Survey of Professional Forecasters and perform a novel three-way decomposition of bond yields into (i) average expectations about short rates (ii) risk premia and (iii) a speculative component due to heterogeneous expectations about the resale value of a bond. We prove that the speculative term must be orthogonal to public information in real time and therefore statistically distinct from risk premia. Empirically, the speculative component is quantitatively important, accounting for up to one percentage point of US yields. Furthermore, estimates of historical risk premia from the heterogeneous information model are less volatile than, and negatively correlated with, risk premia estimated using a standard Affine Gaussian Term Structure model.

Though linear projections of returns on the slope of the yield curve have contradicted the implications of the traditional expectations theory, ' we show that these findings are not puzzling relative to a large class of richer dynamic term structure models. Specifically, we are able to match all of the key empirical findings reported by Fama and Bliss and Campbell and Shiller, among others, within large subclasses of affine and quadratic-Gaussian term structure models. Additionally, we show that certain risk-premium adjusted' projections of changes in yields on the slope of the yield curve recover the coefficients of unity predicted by the models. Key to this matching are parameterizations of the market prices of risk that let the risk factors affect the market prices of risk directly, and not only through the factor volatilities. The risk premiums have a simple form consistent with Fama's findings on the predictability of forward rates, and are shown to also be consistent with interest rate, feedback rules used by a monetary authority in setting monetary policy

This paper presents a dynamic equilibrium model of bond markets, in which two groups of agents hold heterogeneous expectations about future economic conditions. Our model shows that heterogeneous expectations can not only lead to speculative trading, but can also help resolve several challenges to standard representative-agent models of the yield curve. First, the relative wealth fluctuation between the two groups of agents caused by their speculative positions amplifies bond yield volatility, thus providing an explanation for the "excessive volatility puzzle" of bond yields. In addition, the fluctuation in the two groups' expectations and relative wealth also generates time-varying risk premia, which in turn can help explain the failure of the expectation hypothesis. These implications, essentially induced by trading between agents, highlight the importance of incorporating heterogeneous expectations into economic analysis of bond markets.

We construct an affine model that incorporates bond risk premia. By understanding risk premia, we are able to use a lot of information from well-measured risk-neutral dynamics to characterize real expectations. We use the model to decompose the yield curve into expected interest rate and risk premium components. We characterize the interesting term structure of risk premia -- a forward rate reflects expected excess returns many years into the future, and current slope and curvature factors forecast future expected returns even though they do not forecast current returns.

This book was originally published by Macmillan in 1936. It was voted the top Academic Book that Shaped Modern Britain by Academic Book Week (UK) in 2017, and in 2011 was placed on Time Magazine's top 100 non-fiction books written in English since 1923. Reissued with a fresh Introduction by the Nobel-prize winner Paul Krugman and a new Afterword by Keynes’ biographer Robert Skidelsky, this important work is made available to a new generation. The General Theory of Employment, Interest and Money transformed economics and changed the face of modern macroeconomics. Keynes’ argument is based on the idea that the level of employment is not determined by the price of labour, but by the spending of money. It gave way to an entirely new approach where employment, inflation and the market economy are concerned. Highly provocative at its time of publication, this book and Keynes’ theories continue to remain the subject of much support and praise, criticism and debate. Economists at any stage in their career will enjoy revisiting this treatise and observing the relevance of Keynes’ work in today’s contemporary climate.