omy 86 (Aug. 1978), 673-700. , A Note on Maximum Likelihood Estimation of the Expectations Model of the Term Structure, Journal of Monetary Economics 5 (1979), 133-143. Sargent, Thomas J., and Neil Wallace, Rational Expectations, the Optimal Monetary Instrument, and the Optimal Money Supply Rule, Journal of Political Economy 83 (Apr. 1975), 241-254. Zellner, Arnold, An Efficient Method of Estimating Seemingly Unrelated Regressions and Tests for Aggregation Bias, Journal of the American Statistical Association 57 (1962), 348-368.