10 Savings in this context could be thought of as domestic or foreign savings, if referring to a closed or open  economy, respectively. 11 Lewis (2016) uses various surveyed measures of inflation expectations and yield curve modelling techniques to  develop a framework for monitoring inflation expectations.
12 For example, a sustained fall in productivity growth lowers the returns to investment, making it less desirable to  invest. If the desire to invest falls and the desire to save remains unchanged, a lower neutral rate will be required to reconcile savings and investment plans.