After reading a pre-print copy of the time series book by George Box and Gwilym Jenkins in 1968, Granger became interested in forecasting. For the next few years he worked on this subject with his post-doctoral student, Paul Newbold; and they wrote a book which became a standard reference in time series forecasting (published in 1977). Using simulations, Granger and Newbold also wrote the famous 1974 paper on spurious regression which led to a re-evaluation of previous empirical work in economics and to the econometric methodology.