President Donald Trump regularly declares that he's winning his trade wars. Yet evidence is growing that the U.S. economy is a net loser so far.

In two separate papers published over the weekend, some of the world's leading trade economists declared Trump's tariffs to be the most consequential trade experiment seen since the 1930 Smoot-Hawley tariffs blamed for worsening the Great Depression. They also found the initial cost of Trump's duties to the U.S. economy was in the billions and being borne largely by American consumers.

In a study published on Saturday, economists from the Federal Reserve Bank of New York, Princeton University and Columbia University found that tariffs imposed last year by Trump on products ranging from washing machines and steel to some $250 billion in Chinese imports were costing U.S. companies and consumers $3 billion a month in additional tax costs and companies a further $1.4 billion in deadweight losses. They also were causing the diversion of $165 billion a year in trade leading to significant costs for companies having to reorganize supply chains.