We propose a new investment strategy, the improved cross-asset time-series momentum (I-XTSM) strategy, to improve investment performance. Using data on 25 investment portfolios and common commodities for the period from January 1990 to April 2021, we find that the I-XTSM strategy increases...

The permanent income hypothesis implies that frictionless open economies with exhaustible natural resources should save abroad most of their resource windfalls and, therefore, feature current account surpluses. Resource-rich developing countries (RRDCs), on the other hand, face substantial...