Could Donald Trump’s actions on trade and tariffs see a repeat of the 1930s slump? A group of experts certainty think it could happen:

Over a thousand economists have written to Donald Trump warning his “economic protectionism” and tough rhetoric on trade threatens to repeat the mistakes the US made in the 1930s, mistakes that plunged the world into the Great Depression.

The 1,414 economists, including 14 Nobel prize winners, sent the letter on Thursday amid an escalating row over trade between the US and the European Union. Trump has imposed tariffs on steel and aluminium imports but has granted temporary reprieves to the EU, Australia and other countries.

“In 1930, 1,028 economists urged Congress to reject the protectionist Smoot-Hawley Tariff Act,” the authors write, citing a trade act that many economists argue was one of the triggers for the Great Depression.

“Today, Americans face a host of new protectionist activity, including threats to withdraw from trade agreements, misguided calls for new tariffs in response to trade imbalances, and the imposition of tariffs on washing machines, solar components, and even steel and aluminum used by US manufacturers.

“Congress did not take economists’ advice in 1930, and Americans across the country paid the price. The undersigned economists and teachers of economics strongly urge you not to repeat that mistake. Much has changed since 1930 – for example, trade is now significantly more important to our economy – but the fundamental economic principles as explained at the time have not.”