Real Gold Price and Future Gold Return

Does the real (inflation-adjusted) price of gold indicate future gold return? If so, what is the current indication? In their August 2020 paper entitled “Gold, the Golden Constant, COVID-19, ‘Massive Passives’ and Déjà Vu”, Claude Erb, Campbell Harvey and Tadas Viskanta examine behavior and implications of real gold price (gold price in U.S. dollars per ounce divided by the U.S. consumer price index) based on the assumption that the main investor interest in gold is as an inflation hedge. Specifically, they look at interactions among gold price, U.S. inflation, real gold price, government bond (10-year U.S. Treasury note) yield, expected U.S. inflation (difference between 10-year Treasury note and 10-year inflation protected Treasury yields) and gold demand as measured by holdings of the top two gold exchange-traded funds (ETF). Using data for these variables as available during January 1975 (inception of gold futures trading) through July 2020, they find that:

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