A reevaluation of the macroeconomic effects of positive trend inflation

To date, most of the papers which have examined the effects of trend inflation on the properties of New Keynesian model were based on relatively simple sticky-prices DSGE models and whose realism was sometimes questionable. In this paper, we re-evaluate the macroeconomic effects of non-zero trend inflation. Building on the model of Ascari (2004) as one of the most-cited papers in the literature on the effects of trend inflation, we show that the omission of some important theoretical ingredients significantly distorts the results obtained to date. We propose a refinement of this model by introducing two theoretical important ingredients, namely investment adjustment costs, and a roundabout production structure. Once we add these features to make the model more realistic, as commonly for medium-scale models, we find that the standard New Keynesian model without real frictions overestimates the short-term macroeconomic effects of a positive trend inflation rate and underestimates those of the long term.